Update codecov/codecov-action action to v6

Author: renovate[bot]

.github/workflows/BuildOnly.yml

@@ -54,7 +54,7 @@ jobs:
         configuration: Release
 
     - name: Upload Code Coverage
-      uses: codecov/codecov-action@v5
+      uses: codecov/codecov-action@v6
 
     - name: Create NuGet Artifacts
       uses: actions/upload-artifact@master