feat: POST /repos/{owner}/{repo}/releases/{release_id}/reactions, POST /repos/{owner}/{repo}/content_references/{content_reference_id}/attachments, GET /repos/{owner}/{repo}/compare/{basehead}. Deprecates GET /repos/{owner}/{repo}/compare/{base}...{head} and GET /repos/{owner}/{repo}/content_references/{content_reference_id}/attachments via [octokit/openapi v2.21.0](https://github.com/octokit/openapi/releases/tag/v2.21.0) (#89)

Author: octokitbot