Bump @octokit/webhooks from 13.4.1 to 13.7.4

Bumps [@octokit/webhooks](https://github.com/octokit/webhooks.js) from 13.4.1 to 13.7.4.
- [Release notes](https://github.com/octokit/webhooks.js/releases)
- [Commits](octokit/webhooks.js@v13.4.1...v13.7.4)

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

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Author: dependabot[bot]