Bump codecov/codecov-action from 3.1.5 to 4.0.1

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from 3.1.5 to 4.0.1.
- [Release notes](https://github.com/codecov/codecov-action/releases)
- [Changelog](https://github.com/codecov/codecov-action/blob/main/CHANGELOG.md)
- [Commits](codecov/codecov-action@v3.1.5...v4.0.1)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/unit-test.yml

@@ -40,4 +40,4 @@ jobs:
       run: coverage run --branch --source=check -m unittest discover --buffer
 
     - name: Upload coverage to Codecov
-      uses: codecov/codecov-action@v3.1.5
+      uses: codecov/codecov-action@v4.0.1