build(deps): bump @octokit/app from 14.0.0 to 15.1.0

Bumps [@octokit/app](https://github.com/octokit/app.js) from 14.0.0 to 15.1.0.
- [Release notes](https://github.com/octokit/app.js/releases)
- [Commits](octokit/app.js@v14.0.0...v15.1.0)

---
updated-dependencies:
- dependency-name: "@octokit/app"
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

package.json

@@ -40,7 +40,7 @@
   },
   "dependencies": {
     "@hono/node-server": "^1.11.1",
-    "@octokit/app": "^14.0.0",
+    "@octokit/app": "^15.1.0",
     "@octokit/core": "^5.0.0",
     "@octokit/rest": "^20.0.1",
     "@octokit/webhooks": "^12.0.3",