fix trailing comma

Author: k-dominik

.github/workflows/test.yml

@@ -45,7 +45,7 @@ jobs:
       - uses: codecov/codecov-action@v4
         if: matrix.os == 'ubuntu-latest'
         with:
-          files: ./coverage.xml,
+          files: ./coverage.xml
           fail_ci_if_error: true # optional (default = false)
           verbose: true # optional (default = false)
         env: