Bump codecov/codecov-action from 3 to 4 in the actions group

Bumps the actions group with 1 update: [codecov/codecov-action](https://github.com/codecov/codecov-action).


Updates `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
  dependency-group: actions
...

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

.github/workflows/coverage.yml

@@ -31,4 +31,4 @@ jobs:
           python -m pytest --cov=yaml2ics --doctest-modules --durations=20
 
       - name: Upload to codecov
-        uses: codecov/codecov-action@v3
+        uses: codecov/codecov-action@v4