Bump codecov/codecov-action from 3 to 4 (#108)

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from 3 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@v3...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]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Adam Li <[email protected]>

Author: dependabot[bot]

.github/workflows/main.yml

@@ -143,7 +143,7 @@ jobs:
           pytest --cov pywhy_graphs ./pywhy_graphs
       - name: Upload coverage stats to codecov
         if: ${{ matrix.os == 'ubuntu' && matrix.python-version == '3.11' && matrix.networkx == 'stable' }}
-        uses: codecov/codecov-action@v3
+        uses: codecov/codecov-action@v4
         with:
           files: ./coverage.xml
           fail_ci_if_error: true