Bump octokit from 4.20.0 to 4.21.0
Bump octokit from 4.20.0 to 4.21.0

Bumps [octokit](https://github.com/octokit/octokit.rb) from 4.20.0 to 4.21.0.
- [Release notes](https://github.com/octokit/octokit.rb/releases)
- [Changelog](https://github.com/octokit/octokit.rb/blob/4-stable/RELEASE.md)
- [Commits](https://github.com/octokit/octokit.rb/compare/v4.20.0...v4.21.0)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
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