Bump codecov/codecov-action from 2 to 4

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from 2 to 4.
- [Release notes](https://github.com/codecov/codecov-action/releases)
- [Changelog](https://github.com/codecov/codecov-action/blob/main/CHANGELOG.md)
- [Commits](codecov/codecov-action@v2...v4)

---
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/test.yml

@@ -60,7 +60,7 @@ jobs:
       with:
         path: |
           ./report-*.json
-    - uses: codecov/codecov-action@v2
+    - uses: codecov/codecov-action@v4
     - name: Build docs
       if: ${{ matrix.python-version == '3.11'}}
       run: |