Bump codecov/codecov-action from 4 to 5 (#353)

* Bump codecov/codecov-action from 4 to 5

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from 4 to 5.
- [Release notes](https://github.com/codecov/codecov-action/releases)
- [Changelog](https://github.com/codecov/codecov-action/blob/main/CHANGELOG.md)
- [Commits](codecov/codecov-action@v4...v5)

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

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

* Update ci.yaml

---------

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

.github/workflows/ci.yaml

@@ -96,10 +96,10 @@ jobs:
         pytest --doctest-modules openmmforcefields --ignore=openmmforcefields/tests
 
     - name: Upload coverage report to CodeCov
-      uses: codecov/codecov-action@v4
+      uses: codecov/codecov-action@v5
       if: ${{ github.repository == 'openmm/openmmforcefields'
               && github.event != 'schedule' }}
       with:
         token: ${{ secrets.CODECOV_TOKEN }}
-        file: ./coverage.xml
+        files: ./coverage.xml
         fail_ci_if_error: false  # I don't want this to cause CI failures when a developer pushes to a fork