`rubygems` component upgrade test plan

Copy the following test plan to a comment of the merge request that upgrades the component.

## Test plan

- [ ] Checked rubygems [changelog](https://github.com/rubygems/rubygems/blob/master/CHANGELOG.md) for potential breaking changes.
- [ ] Checked that the `bundler` gem was updated to the corresponding version
  noted in the changelog.
- [ ] Checked that the `BUNDLED_WITH` version in the `Gemfile.lock` was updated
  to the corresponding version noted in the changelog.
- [ ] Performed a successful GitLab Enterprise Edition (EE) build on `gitlab.com`
  on all supported platforms (include `build-package-on-all-os` job).
- [ ] Ran `qa-subset-test` as well as manual `qa-remaining-test-manual` CI/CD
  test job for both GitLab Enterprise Edition and GitLab Community Edition.
- [ ] Performed a successful GitLab Community Edition (CE) build on
  `dev.gitlab.org`.
- Checked installed gem versions:
  - [ ] `rubygems`

    ```shell
    gem list rubygems
    ```

  - [ ] `bundler`

    ```shell
    gem list bundler
    ```

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rubygems component upgrade test plan