Bump codecov/codecov-action from 3 to 4; explicitly pass the Codeco…

…v token; use the org-wide Codecov token; fail CI if the Codecov upload fails (so that we quickly notice if the Codecov uploads start having problems) (#82)

* 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>

* Fail CI if the Codecov upload fails

This allows us to very quickly notice if the Codecov upload starts having problems.

* Explicitly pass the Codecov token

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Dilum Aluthge <dilum@aluthge.com>

.github/workflows/CI.yml

@@ -35,9 +35,11 @@ jobs:
         env:
           JULIA_NUM_THREADS: 4
       - uses: julia-actions/julia-processcoverage@v1
-      - uses: codecov/codecov-action@v3
+      - uses: codecov/codecov-action@v4
         with:
           file: lcov.info
+          fail_ci_if_error: true # So that we notice quickly if Codecov is not uploading
+          token: ${{ secrets.CODECOV_TOKEN }}
   docs:
     name: Documentation
     runs-on: ubuntu-latest