Revert copilot-setup-steps to dotnet 6.0.x

Author: data-douser

.github/workflows/copilot-setup-steps.yml

@@ -19,7 +19,7 @@ jobs:
     - name: Setup .NET 6.0.x
       uses: actions/setup-dotnet@v4
       with:
-        dotnet-version: 6.0.0
+        dotnet-version: 6.0.x
 
     - name: Verify .NET installation
       run: |
@@ -61,4 +61,4 @@ jobs:
         echo "✅ .NET 6.0.x: $(dotnet --version)"
         echo "✅ GitHub CLI: $(gh --version | head -n1)"
         echo "✅ System tools: unzip, curl available"
-        echo "✅ QLT CLI: Ready for CodeQL development tasks"
+        echo "✅ QLT CLI: Ready for CodeQL development tasks"