Bump codecov/codecov-action from 2.1.0 to 3.1.0

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from 2.1.0 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@v2.1.0...v3.1.0)

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

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

.github/workflows/test.yml

@@ -45,7 +45,7 @@ jobs:
       - name: Generate coverage report
         run: pytest --cov-report=xml
       - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@v2.1.0
+        uses: codecov/codecov-action@v3.1.0
         with:
           file: ./coverage.xml
           flags: unittests