Bump @octokit/endpoint and @octokit/rest in /.github/actions/channel

Bumps [@octokit/endpoint](https://github.com/octokit/endpoint.js) to 10.1.3 and updates ancestor dependency [@octokit/rest](https://github.com/octokit/rest.js). These dependencies need to be updated together.


Updates `@octokit/endpoint` from 6.0.12 to 10.1.3
- [Release notes](https://github.com/octokit/endpoint.js/releases)
- [Commits](octokit/endpoint.js@v6.0.12...v10.1.3)

Updates `@octokit/rest` from 18.12.0 to 21.1.0
- [Release notes](https://github.com/octokit/rest.js/releases)
- [Commits](octokit/rest.js@v18.12.0...v21.1.0)

---
updated-dependencies:
- dependency-name: "@octokit/endpoint"
  dependency-type: indirect
- dependency-name: "@octokit/rest"
  dependency-type: direct:production
...

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

Author: dependabot[bot]