build(deps-dev): bump @octokit/openapi from 19.1.0 to 20.0.0

Bumps [@octokit/openapi](https://github.com/octokit/openapi) from 19.1.0 to 20.0.0.
- [Release notes](https://github.com/octokit/openapi/releases)
- [Commits](octokit/openapi@v19.1.0...v20.0.0)

---
updated-dependencies:
- dependency-name: "@octokit/openapi"
  dependency-version: 20.0.0
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

package-lock.json

@@ -23,7 +23,7 @@
     "undici": "^7.16.0"
   },
   "devDependencies": {
-    "@octokit/openapi": "^19.1.0",
+    "@octokit/openapi": "^21.0.0",
     "@sinonjs/fake-timers": "^14.0.0",
     "ava": "^6.4.1",
     "c8": "^10.1.3",