ci(dependabot): bump codecov/codecov-action from 3 to 5

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from 3 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@v3...v5)

---
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>

.github/workflows/tests.yml

@@ -37,7 +37,7 @@ jobs:
         run: python -m tox
 
       - name: Coverage
-        uses: codecov/codecov-action@v3
+        uses: codecov/codecov-action@v5
 
   nme_fail:
     name: "Test if nme properly fail on old releases"