Build(deps): Bump codecov/codecov-action from 3 to 4

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from 3 to 4.
- [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...v4)

---
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/unit_tests.yml

@@ -56,7 +56,7 @@ jobs:
 
     - name: Upload Results to CodeCov
       if: success()
-      uses: codecov/codecov-action@v3
+      uses: codecov/codecov-action@v4
       with:
         env_vars: TOXENV
         fail_ci_if_error: false