Bump codecov/codecov-action in the actions group across 1 directory

Bumps the actions group with 1 update in the / directory: [codecov/codecov-action](https://github.com/codecov/codecov-action).


Updates `codecov/codecov-action` from 4.6.0 to 5.3.1
- [Release notes](https://github.com/codecov/codecov-action/releases)
- [Changelog](https://github.com/codecov/codecov-action/blob/main/CHANGELOG.md)
- [Commits](codecov/codecov-action@v4.6.0...v5.3.1)

---
updated-dependencies:
- dependency-name: codecov/codecov-action
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: actions
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/python-app.yml

@@ -27,7 +27,7 @@ jobs:
         run: pixi run -e ${{ matrix.environment }} test
 
       - name: Upload coverage reports to Codecov
-        uses: codecov/codecov-action@v4.6.0
+        uses: codecov/codecov-action@v5.3.1
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
           slug: scikit-learn-contrib/project-template