Update GitHub Actions

Author: gdziadkiewicz

.github/workflows/main.yml

@@ -22,9 +22,9 @@ jobs:
 
     steps:
     - name: Checkout
-      uses: actions/checkout@v4
+      uses: actions/checkout@v5
     - name: Setup .NET for main project build
-      uses: actions/setup-dotnet@v4
+      uses: actions/setup-dotnet@v5
       with:
         dotnet-version: |
           8.0.x