Update dependency @octokit/webhooks to v12

Author: renovate[bot]

package-lock.json

@@ -27,7 +27,7 @@
   "dependencies": {
     "@actions/core": "1.2.6",
     "@actions/github": "5.1.1",
-    "@octokit/webhooks": "9.23.0",
+    "@octokit/webhooks": "12.0.3",
     "git-blame-json": "1.0.2",
     "php-codesniffer": "1.0.2",
     "picomatch": "2.2.2"