build(deps): bump @octokit/auth-app from 2.8.0 to 2.9.0

Bumps [@octokit/auth-app](https://github.com/octokit/auth-app.js) from 2.8.0 to 2.9.0.
- [Release notes](https://github.com/octokit/auth-app.js/releases)
- [Commits](octokit/auth-app.js@v2.8.0...v2.9.0)

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Author: dependabot[bot]