Update actions/setup-dotnet from v4 to v5

Author: rufer7

.github/workflows/azure-webapps-dotnet-core.yml

@@ -22,7 +22,7 @@ jobs:
       - uses: actions/checkout@v4
 
       - name: Set up .NET Core
-        uses: actions/setup-dotnet@v4
+        uses: actions/setup-dotnet@v5
         with:
           dotnet-version: ${{ env.DOTNET_VERSION }}