Bump codecov/codecov-action from 4 to 5 (#83)

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]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/unittest.yml

@@ -21,6 +21,6 @@ jobs:
       run: pip install . coverage
     - name: Test
       run: cd tests && coverage run --source=../dpti -m unittest && cd .. && coverage combine tests/.coverage && coverage report
-    - uses: codecov/codecov-action@v4
+    - uses: codecov/codecov-action@v5
       env:
         CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}