Bump codecov/codecov-action from 5 to 6 in the action-dependencies group (#286)

Bumps the action-dependencies group with 1 update: [codecov/codecov-action](https://github.com/codecov/codecov-action).


Updates `codecov/codecov-action` from 5 to 6
- [Release notes](https://github.com/codecov/codecov-action/releases)
- [Changelog](https://github.com/codecov/codecov-action/blob/main/CHANGELOG.md)
- [Commits](codecov/codecov-action@v5...v6)

---
updated-dependencies:
- dependency-name: codecov/codecov-action
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: action-dependencies
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/tests.yml

@@ -36,7 +36,7 @@ jobs:
         coverage xml
 
     - name: upload to codecov.io
-      uses: codecov/codecov-action@v5
+      uses: codecov/codecov-action@v6
       with:
         files: ./tests/coverage.xml
         token: ${{ secrets.CODECOV_TOKEN }}