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] <support@github.com>

.github/workflows/run-tests.yml

@@ -38,7 +38,7 @@ jobs:
       - name: Run linter and tests
         run: make test-ci
       - name: Update code coverage
-        uses: codecov/codecov-action@v3.1.5
+        uses: codecov/codecov-action@v4.0.1
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
           flags: unittests