Update actions/setup-dotnet from v4 to v5

Author: rufer7

.github/workflows/dotnet.yml

@@ -15,7 +15,7 @@ jobs:
 
       - uses: actions/checkout@v4
       - name: Setup .NET
-        uses: actions/setup-dotnet@v4
+        uses: actions/setup-dotnet@v5
         with:
           dotnet-version: 9.0.x