fixup! [ADD] add sparse flag

Author: TimSiebert1

.github/workflows/coverage.yml

@@ -61,5 +61,6 @@ jobs:
       uses: codecov/codecov-action@v4
       with:
         files: build/coverage.info
+        token: ${{ secrets.CODECOV_TOKEN }}
         flags: unittests
         name: code-coverage-report