Bump codecov/codecov-action from 3 to 4

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](https://github.com/codecov/codecov-action/compare/v3...v4)

---
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/ci.yml

@@ -101,7 +101,7 @@ jobs:
         # Prevent running from the forked repository that doesn't need to upload coverage.
         # In addition, running on the forked repository would fail as missing the necessary secret.
         if: ${{ github.repository == 'karmada-io/karmada' }}
-        uses: codecov/codecov-action@v3
+        uses: codecov/codecov-action@v4
         with:
           # Even though token upload token is not required for public repos,
           # but adding a token might increase successful uploads as per: