Bump @octokit/request-error and @actions/github (#277)

Bumps [@octokit/request-error](https://github.com/octokit/request-error.js) to 5.1.1 and updates ancestor dependency [@actions/github](https://github.com/actions/toolkit/tree/HEAD/packages/github). These dependencies need to be updated together.


Updates `@octokit/request-error` from 2.1.0 to 5.1.1
- [Release notes](https://github.com/octokit/request-error.js/releases)
- [Commits](octokit/request-error.js@v2.1.0...v5.1.1)

Updates `@actions/github` from 5.1.1 to 6.0.0
- [Changelog](https://github.com/actions/toolkit/blob/main/packages/github/RELEASES.md)
- [Commits](https://github.com/actions/toolkit/commits/HEAD/packages/github)

---
updated-dependencies:
- dependency-name: "@octokit/request-error"
  dependency-type: indirect
- dependency-name: "@actions/github"
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]