Update dotnet.yml

Author: prozolic

.github/workflows/dotnet.yml

@@ -19,7 +19,9 @@ jobs:
     - name: Setup .NET
       uses: actions/setup-dotnet@v4
       with:
-        dotnet-version: 8.0.x
+        dotnet-version: |
+            6.0.x
+            8.0.x
     - name: Restore dependencies
       run: dotnet restore
     - name: Build