Bump codecov/codecov-action from 3 to 6

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from 3 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@v3...v6)

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

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

Author: dependabot[bot]

.github/workflows/tests.yaml

@@ -272,7 +272,7 @@ jobs:
           always() &&
           (steps.run_tests.outcome == 'success' || steps.run_tests.outcome == 'failure') &&
           github.event_name != 'schedule'
-        uses: codecov/codecov-action@v3
+        uses: codecov/codecov-action@v6
         with:
           name: ${{ env.TEST_ID }}
           # See https://community.codecov.com/t/upload-issues-unable-to-locate-build-via-github-actions-api/3954