Bump codecov/codecov-action from 5.1.1 to 5.1.2 in the actions group

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


Updates `codecov/codecov-action` from 5.1.1 to 5.1.2
- [Release notes](https://github.com/codecov/codecov-action/releases)
- [Changelog](https://github.com/codecov/codecov-action/blob/main/CHANGELOG.md)
- [Commits](codecov/codecov-action@v5.1.1...v5.1.2)

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

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

.github/workflows/testing.yml

@@ -37,7 +37,7 @@ jobs:
         run: pixi run -e ${{ matrix.environment }} test -n auto
 
       - name: Upload coverage reports to Codecov
-        uses: codecov/[email protected].1
+        uses: codecov/[email protected].2
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
           slug: skrub-data/skrub