Bump codecov/codecov-action from 5.3.1 to 5.4.0 (#293)

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from 5.3.1 to 5.4.0.
- [Release notes](https://github.com/codecov/codecov-action/releases)
- [Changelog](https://github.com/codecov/codecov-action/blob/main/CHANGELOG.md)
- [Commits](codecov/codecov-action@v5.3.1...v5.4.0)

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

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

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -97,7 +97,7 @@ jobs:
         python -m pytest --cov=pint_xarray --cov-report=xml
 
     - name: Upload code coverage to Codecov
-      uses: codecov/codecov-action@v5.3.1
+      uses: codecov/codecov-action@v5.4.0
       with:
         file: ./coverage.xml
         flags: unittests