Update dotnet.yml

Author: jogibear9988

.github/workflows/dotnet.yml

@@ -16,7 +16,7 @@ jobs:
     - name: Setup .NET
       uses: actions/setup-dotnet@v1
       with:
-        dotnet-version: 5.0.x
+        dotnet-version: 8.0.x
 
     - name: GitVersion
       id: gitversion  # step id used as reference for output values