build(deps): bump codecov/codecov-action from 3 to 4 (#226)

* 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] <[email protected]>
---------

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Matthew Feickert <[email protected]>

.github/workflows/ci.yml

@@ -49,16 +49,17 @@ jobs:
       run: |
         pytest -r sx tests/
 
-      # Report coverage for oldest and newest Python tested to guard against version differences
     - name: Report core project coverage with Codecov
       if: >-
         github.event_name != 'schedule' &&
         matrix.os == 'ubuntu-latest'
-      uses: codecov/codecov-action@v3
+      uses: codecov/codecov-action@v4
       with:
+        fail_ci_if_error: true
         files: ./coverage.xml
         flags: unittests-${{ matrix.python-version }}
         name: pylhe
+        token: ${{ secrets.CODECOV_TOKEN }}
 
   docker: