Bump @octokit/plugin-rest-endpoint-methods in /pr-checks

Bumps [@octokit/plugin-rest-endpoint-methods](https://github.com/octokit/plugin-rest-endpoint-methods.js) from 17.0.0 to 18.0.0.
- [Release notes](https://github.com/octokit/plugin-rest-endpoint-methods.js/releases)
- [Commits](octokit/plugin-rest-endpoint-methods.js@v17.0.0...v18.0.0)

---
updated-dependencies:
- dependency-name: "@octokit/plugin-rest-endpoint-methods"
  dependency-version: 18.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

pr-checks/package.json

@@ -6,7 +6,7 @@
     "@actions/github": "^8.0.1",
     "@octokit/core": "^7.0.6",
     "@octokit/plugin-paginate-rest": ">=9.2.2",
-    "@octokit/plugin-rest-endpoint-methods": "^17.0.0",
+    "@octokit/plugin-rest-endpoint-methods": "^18.0.0",
     "semver": "^7.8.5",
     "yaml": "^2.9.0"
   },