Bump codecov/codecov-action from 3.0.0 to 3.1.0

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from 3.0.0 to 3.1.0.
- [Release notes](https://github.com/codecov/codecov-action/releases)
- [Changelog](https://github.com/codecov/codecov-action/blob/master/CHANGELOG.md)
- [Commits](codecov/codecov-action@v3.0.0...v3.1.0)

---
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>

.github/workflows/run-tests.yml

@@ -40,7 +40,7 @@ jobs:
       - name: Run linter and tests
         run: make test-ci
       - name: Update code coverage
-        uses: codecov/codecov-action@v3.0.0
+        uses: codecov/codecov-action@v3.1.0
         with:
           flags: unittests
           fail_ci_if_error: true # optional (default = false)