Update dependency @octokit/rest to v21

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@octokit/rest	^19.0.0 -> ^21.0.0

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Release Notes

octokit/rest.js (@​octokit/rest)

### [`v21.0.0`](https://togithub.com/octokit/rest.js/compare/v20.1.1...12b6c6521dc767a8c127fbbfcc74b0c76d1ab056) [Compare Source](https://togithub.com/octokit/rest.js/compare/v20.1.1...v21.0.0) ### [`v20.1.1`](https://togithub.com/octokit/rest.js/releases/tag/v20.1.1) [Compare Source](https://togithub.com/octokit/rest.js/compare/v20.1.0...v20.1.1) ##### Bug Fixes - update REST endpoints ([#​428](https://togithub.com/octokit/rest.js/issues/428)) ([7058346](https://togithub.com/octokit/rest.js/commit/7058346922bede2db35bbf1c2145b1976310df69)) ### [`v20.1.0`](https://togithub.com/octokit/rest.js/releases/tag/v20.1.0) [Compare Source](https://togithub.com/octokit/rest.js/compare/v20.0.2...v20.1.0) ##### Features - **security:** Add provenance ([#​420](https://togithub.com/octokit/rest.js/issues/420)) ([9adf1a4](https://togithub.com/octokit/rest.js/commit/9adf1a4a3da67afab4895b22877fa5c93e99bd74)) ### [`v20.0.2`](https://togithub.com/octokit/rest.js/releases/tag/v20.0.2) [Compare Source](https://togithub.com/octokit/rest.js/compare/v20.0.1...v20.0.2) ##### Bug Fixes - **deps:** update octokit monorepo (major) ([#​363](https://togithub.com/octokit/rest.js/issues/363)) ([258bf80](https://togithub.com/octokit/rest.js/commit/258bf80a891579aefa3e6c303b91445bff4d19f9)) ### [`v20.0.1`](https://togithub.com/octokit/rest.js/releases/tag/v20.0.1) [Compare Source](https://togithub.com/octokit/rest.js/compare/v20.0.0...v20.0.1) ##### Bug Fixes - **deps:** update dependency [@​octokit/plugin-request-log](https://togithub.com/octokit/plugin-request-log) to v4 ([#​322](https://togithub.com/octokit/rest.js/issues/322)) ([688f86a](https://togithub.com/octokit/rest.js/commit/688f86a768581fbc411d1f34210fd3d1e01bbdf6)) ### [`v20.0.0`](https://togithub.com/octokit/rest.js/releases/tag/v20.0.0) [Compare Source](https://togithub.com/octokit/rest.js/compare/v19.0.13...v20.0.0) ##### Features - v20 ([#​305](https://togithub.com/octokit/rest.js/issues/305)) ([5429dfd](https://togithub.com/octokit/rest.js/commit/5429dfd12173e9888e17d4eb47b93a087cb605e6)) ##### BREAKING CHANGES - Drop support for NodeJS v14, v16 - Remove previews support for the REST API - remove agent option from `octokit.request()`

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