actions: update actions to latest version

Author: Jaxelr

.github/workflows/ci.yml

@@ -12,9 +12,9 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v5
     - name: Setup .NET
-      uses: actions/setup-dotnet@v3
+      uses: actions/setup-dotnet@v5
       with:
         dotnet-version: 9.0.x
     - name: Format Code