deps: bump thiserror from 1.0.69 to 2.0.18 (#1519)

Bumps [thiserror](https://github.com/dtolnay/thiserror) from 1.0.69 to
2.0.18.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/dtolnay/thiserror/releases">thiserror's
releases</a>.</em></p>
<blockquote>
<h2>2.0.18</h2>
<ul>
<li>Make compatible with project-level <code>needless_lifetimes =
&quot;forbid&quot;</code> (<a
href="https://redirect.github.com/dtolnay/thiserror/issues/443">#443</a>,
thanks <a
href="https://github.com/LucaCappelletti94"><code>@​LucaCappelletti94</code></a>)</li>
</ul>
<h2>2.0.17</h2>
<ul>
<li>Use differently named __private module per patch release (<a
href="https://redirect.github.com/dtolnay/thiserror/issues/434">#434</a>)</li>
</ul>
<h2>2.0.16</h2>
<ul>
<li>Add to &quot;no-std&quot; crates.io category (<a
href="https://redirect.github.com/dtolnay/thiserror/issues/429">#429</a>)</li>
</ul>
<h2>2.0.15</h2>
<ul>
<li>Prevent <code>Error::provide</code> API becoming unavailable from a
future new compiler lint (<a
href="https://redirect.github.com/dtolnay/thiserror/issues/427">#427</a>)</li>
</ul>
<h2>2.0.14</h2>
<ul>
<li>Allow build-script cleanup failure with NFSv3 output directory to be
non-fatal (<a
href="https://redirect.github.com/dtolnay/thiserror/issues/426">#426</a>)</li>
</ul>
<h2>2.0.13</h2>
<ul>
<li>Documentation improvements</li>
</ul>
<h2>2.0.12</h2>
<ul>
<li>Prevent elidable_lifetime_names pedantic clippy lint in generated
impl (<a
href="https://redirect.github.com/dtolnay/thiserror/issues/413">#413</a>)</li>
</ul>
<h2>2.0.11</h2>
<ul>
<li>Add feature gate to tests that use std (<a
href="https://redirect.github.com/dtolnay/thiserror/issues/409">#409</a>,
<a
href="https://redirect.github.com/dtolnay/thiserror/issues/410">#410</a>,
thanks <a
href="https://github.com/Maytha8"><code>@​Maytha8</code></a>)</li>
</ul>
<h2>2.0.10</h2>
<ul>
<li>Support errors containing a generic type parameter's associated type
in a field (<a
href="https://redirect.github.com/dtolnay/thiserror/issues/408">#408</a>)</li>
</ul>
<h2>2.0.9</h2>
<ul>
<li>Work around <code>missing_inline_in_public_items</code> clippy
restriction being triggered in macro-generated code (<a
href="https://redirect.github.com/dtolnay/thiserror/issues/404">#404</a>)</li>
</ul>
<h2>2.0.8</h2>
<ul>
<li>Improve support for macro-generated <code>derive(Error)</code> call
sites (<a
href="https://redirect.github.com/dtolnay/thiserror/issues/399">#399</a>)</li>
</ul>
<h2>2.0.7</h2>
<ul>
<li>Work around conflict with #[deny(clippy::allow_attributes)] (<a
href="https://redirect.github.com/dtolnay/thiserror/issues/397">#397</a>,
thanks <a
href="https://github.com/zertosh"><code>@​zertosh</code></a>)</li>
</ul>
<h2>2.0.6</h2>
<ul>
<li>Suppress deprecation warning on generated From impls (<a
href="https://redirect.github.com/dtolnay/thiserror/issues/396">#396</a>)</li>
</ul>
<h2>2.0.5</h2>
<ul>
<li>Prevent deprecation warning on generated impl for deprecated type
(<a
href="https://redirect.github.com/dtolnay/thiserror/issues/394">#394</a>)</li>
</ul>
<h2>2.0.4</h2>
<ul>
<li>Eliminate needless_lifetimes clippy lint in generated
<code>From</code> impls (<a
href="https://redirect.github.com/dtolnay/thiserror/issues/391">#391</a>,
thanks <a
href="https://github.com/matt-phylum"><code>@​matt-phylum</code></a>)</li>
</ul>
<h2>2.0.3</h2>
<ul>
<li>Support the same Path field being repeated in both Debug and Display
representation in error message (<a
href="https://redirect.github.com/dtolnay/thiserror/issues/383">#383</a>)</li>
<li>Improve error message when a format trait used in error message is
not implemented by some field (<a
href="https://redirect.github.com/dtolnay/thiserror/issues/384">#384</a>)</li>
</ul>
<h2>2.0.2</h2>
<!-- raw HTML omitted -->
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="dc0f6a23a3"><code>dc0f6a2</code></a>
Release 2.0.18</li>
<li><a
href="0275292735"><code>0275292</code></a>
Touch up PR 443</li>
<li><a
href="3c33bc60ad"><code>3c33bc6</code></a>
Merge pull request <a
href="https://redirect.github.com/dtolnay/thiserror/issues/443">#443</a>
from LucaCappelletti94/master</li>
<li><a
href="995939cc2e"><code>995939c</code></a>
Reproduce issue 442</li>
<li><a
href="21653d1d33"><code>21653d1</code></a>
Made clippy lifetime allows conditional</li>
<li><a
href="45e5388009"><code>45e5388</code></a>
Update actions/upload-artifact@v5 -&gt; v6</li>
<li><a
href="386aac126a"><code>386aac1</code></a>
Update actions/upload-artifact@v4 -&gt; v5</li>
<li><a
href="ec50561375"><code>ec50561</code></a>
Update actions/checkout@v5 -&gt; v6</li>
<li><a
href="247eab5d79"><code>247eab5</code></a>
Update name of empty_enum clippy lint</li>
<li><a
href="91b181f089"><code>91b181f</code></a>
Raise required compiler to Rust 1.68</li>
<li>Additional commits viewable in <a
href="https://github.com/dtolnay/thiserror/compare/1.0.69...2.0.18">compare
view</a></li>
</ul>
</details>
<br />


[![Dependabot compatibility
score](https://dependabot-badges.githubapp.com/badges/compatibility_score?dependency-name=thiserror&package-manager=cargo&previous-version=1.0.69&new-version=2.0.18)](https://docs.github.com/en/github/managing-security-vulnerabilities/about-dependabot-security-updates#about-compatibility-scores)

Dependabot will resolve any conflicts with this PR as long as you don't
alter it yourself. You can also trigger a rebase manually by commenting
`@dependabot rebase`.

[//]: # (dependabot-automerge-start)
[//]: # (dependabot-automerge-end)

---

<details>
<summary>Dependabot commands and options</summary>
<br />

You can trigger Dependabot actions by commenting on this PR:
- `@dependabot rebase` will rebase this PR
- `@dependabot recreate` will recreate this PR, overwriting any edits
that have been made to it
- `@dependabot show <dependency name> ignore conditions` will show all
of the ignore conditions of the specified dependency
- `@dependabot ignore this major version` will close this PR and stop
Dependabot creating any more for this major version (unless you reopen
the PR or upgrade to it yourself)
- `@dependabot ignore this minor version` will close this PR and stop
Dependabot creating any more for this minor version (unless you reopen
the PR or upgrade to it yourself)
- `@dependabot ignore this dependency` will close this PR and stop
Dependabot creating any more for this dependency (unless you reopen the
PR or upgrade to it yourself)


</details>

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Cargo.lock

@@ -1877,7 +1877,7 @@ dependencies = [
  "serde_json",
  "sha2 0.10.9",
  "tempfile",
- "thiserror 1.0.69",
+ "thiserror 2.0.18",
  "tiktoken-rs",
  "tokenizers",
  "toml",
@@ -1894,7 +1894,7 @@ dependencies = [
  "headroom-core",
  "serde",
  "serde_json",
- "thiserror 1.0.69",
+ "thiserror 2.0.18",
 ]
 
 [[package]]
@@ -1929,7 +1929,7 @@ dependencies = [
  "serde",
  "serde_json",
  "sha2 0.10.9",
- "thiserror 1.0.69",
+ "thiserror 2.0.18",
  "tokio",
  "tokio-stream",
  "tokio-tungstenite",

Cargo.toml

@@ -47,7 +47,7 @@ serde = { version = "1", features = ["derive"] }
 # Enabled here in Phase A so PR-B2 can land as a pure consumer change.
 serde_json = { version = "1", features = ["preserve_order", "arbitrary_precision", "raw_value"] }
 bytes = "1"
-thiserror = "1"
+thiserror = "2"
 # `log` compat: when no tracing subscriber is active (the case inside the
 # headroom-py cdylib), events are re-emitted as `log` records so pyo3-log
 # can forward them to Python's logging. No effect on binaries that install