ci: bump codecov/codecov-action from 5.1.1 to 5.1.2

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from 5.1.1 to 5.1.2.
- [Release notes](https://github.com/codecov/codecov-action/releases)
- [Changelog](https://github.com/codecov/codecov-action/blob/main/CHANGELOG.md)
- [Commits](codecov/codecov-action@v5.1.1...v5.1.2)

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

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/tests.yml

@@ -163,7 +163,7 @@ jobs:
 
       - name: Upload coverage to Codecov
         if: ${{ github.event.pull_request.head.repo.fork == false && github.event.pull_request.user.login != 'dependabot[bot]' }}
-        uses: codecov/[email protected].1
+        uses: codecov/[email protected].2
         with:
           name: codecov-python-${{ matrix.python-version }}
           flags: pytests