Bump @octokit/rest from 19.0.5 to 20.1.1 (#137)

Bumps [@octokit/rest](https://github.com/octokit/rest.js) from 19.0.5 to 20.1.1.
- [Release notes](https://github.com/octokit/rest.js/releases)
- [Commits](octokit/rest.js@v19.0.5...v20.1.1)

---
updated-dependencies:
- dependency-name: "@octokit/rest"
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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