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]>

Author: dependabot[bot]

.github/workflows/test.yml

@@ -154,7 +154,7 @@ jobs:
           ${EXEC} chmod -R a+rw .coverage*
 
       - name: Submit codecov report
-        uses: codecov/codecov-action@v3
+        uses: codecov/codecov-action@v4
 
       - name: Report on slurm
         if: ${{ matrix.cluster_type == 'slurm' && failure() }}