Bump codecov/codecov-action from v1.3.0 to v1.3.1 (#74)

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from v1.3.0 to v1.3.1.
- [Release notes](https://github.com/codecov/codecov-action/releases)
- [Changelog](https://github.com/codecov/codecov-action/blob/master/CHANGELOG.md)
- [Commits](codecov/codecov-action@v1.3.0...fcebab0)

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

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

.github/workflows/codecov.yml

@@ -20,7 +20,7 @@ jobs:
       run: make test
 
     - name: Upload coverage to Codecov
-      uses: codecov/codecov-action@v1.3.0
+      uses: codecov/codecov-action@v1.3.1
       with:
         fail_ci_if_error: true
         file: ./coverage.out