Dependency updates and start of enforcing some C# standards

.github/dependabot.yml

@@ -0,0 +1,6 @@
+version: 2
+updates:
+  - package-ecosystem: "github-actions" # search for actions - there are other options available
+    directory: "/" # search in .github/workflows under root `/`
+    schedule:
+      interval: "weekly" # check for action update every week

.github/workflows/dotnetcore.yml

@@ -9,8 +9,8 @@ jobs:
         os: [windows-latest, ubuntu-latest]
 
     steps:
-    - uses: actions/checkout@v1
-    - uses: actions/setup-dotnet@v1
+    - uses: actions/checkout@v3
+    - uses: actions/setup-dotnet@v2
       with:
         dotnet-version: |
           5.0.x