Bump codecov/codecov-action from 2.0.3 to 2.1.0 (#179)

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from 2.0.3 to 2.1.0.
- [Release notes](https://github.com/codecov/codecov-action/releases)
- [Changelog](https://github.com/codecov/codecov-action/blob/master/CHANGELOG.md)
- [Commits](codecov/codecov-action@v2.0.3...v2.1.0)

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

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Mike Henry <11765982+mikemhenry@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/ci.yaml

@@ -92,7 +92,7 @@ jobs:
       working-directory: ./charmm
 
     - name: CodeCov
-      uses: codecov/codecov-action@v2.0.3
+      uses: codecov/codecov-action@v2.1.0
       with:
         file: ./coverage.xml
         flags: unittests