Bump codecov/codecov-action from 3.1.0 to 4.0.0

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from 3.1.0 to 4.0.0.
- [Release notes](https://github.com/codecov/codecov-action/releases)
- [Changelog](https://github.com/codecov/codecov-action/blob/main/CHANGELOG.md)
- [Commits](codecov/codecov-action@v3.1.0...v4.0.0)

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

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

.github/workflows/tests.yml

@@ -140,6 +140,6 @@ jobs:
           nox --force-color --session=coverage -- xml
 
       - name: Upload coverage report
-        uses: codecov/codecov-action@v3.1.0
+        uses: codecov/codecov-action@v4.0.0
         env: # Or as an environment variable
           super_secret: ${{ secrets.CODECOV_TOKEN }}