Bump codecov/codecov-action from 5.5.4 to 6.0.0

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from 5.5.4 to 6.0.0.
- [Release notes](https://github.com/codecov/codecov-action/releases)
- [Changelog](https://github.com/codecov/codecov-action/blob/main/CHANGELOG.md)
- [Commits](codecov/codecov-action@75cd116...57e3a13)

---
updated-dependencies:
- dependency-name: codecov/codecov-action
  dependency-version: 6.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/test.yml

@@ -40,6 +40,6 @@ jobs:
       run: |
         uv run --all-groups pytest --cov-config=pyproject.toml --cov=pkg --cov-report xml --cov=src
     - name: Upload coverage
-      uses: codecov/codecov-action@75cd11691c0faa626561e295848008c8a7dddffe # v5
+      uses: codecov/codecov-action@57e3a136b779b570ffcdbf80b3bdc90e7fab3de2 # v6.0.0
       with:
         token: ${{ secrets.CODECOV_TOKEN }}