Bump codecov/codecov-action from 4 to 5

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from 4 to 5.
- [Release notes](https://github.com/codecov/codecov-action/releases)
- [Changelog](https://github.com/codecov/codecov-action/blob/main/CHANGELOG.md)
- [Commits](codecov/codecov-action@v4...v5)

---
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/ci_tests.yml

@@ -60,7 +60,7 @@ jobs:
           python -m pytest -v --cov astroNN --doctest-glob="*.rst" --junitxml=junit.xml tests/test_paper_models.py
       - name: Upload coverage reports to Codecov
         continue-on-error: ${{ matrix.ALLOW_FAILURE }}
-        uses: codecov/codecov-action@v4
+        uses: codecov/codecov-action@v5
         env:
           BACKEND: ${{ matrix.BACKEND }}
           KERAS_VER: ${{ env.KERAS_VER }}