chore(deps): update codecov/codecov-action action to v6 (#332)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/ci.yml

@@ -115,7 +115,7 @@ jobs:
         run: uv run --locked pytest --cov-report=xml
 
       - name: Upload coverage report
-        uses: codecov/codecov-action@v5.5.2
+        uses: codecov/codecov-action@v6.0.0
         with:
           env_vars: OS,PYTHON
           disable_search: true