Bump codecov/codecov-action from v1.3.2 to v1.4.0 (#1215)

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from v1.3.2 to v1.4.0.
- [Release notes](https://github.com/codecov/codecov-action/releases)
- [Changelog](https://github.com/codecov/codecov-action/blob/master/CHANGELOG.md)
- [Commits](codecov/codecov-action@v1.3.2...0e28ff8)

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_tests.yaml

@@ -140,7 +140,7 @@ jobs:
 
       # Upload coverage to Codecov
       - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@v1.3.2
+        uses: codecov/codecov-action@v1.4.0
         with:
           file: ./coverage.xml # optional
           env_vars: OS,PYTHON,NUMPY