fix: packages/pull/package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-OCTOKITWEBHOOKS-6129527
- https://snyk.io/vuln/SNYK-JS-PROBOT-6129524

packages/pull/package.json

@@ -26,7 +26,7 @@
     "bunyan-syslog-udp": "^0.2.0",
     "joi": "^17.7.0",
     "js-yaml": "^4.1.0",
-    "probot": "^9.14.1",
+    "probot": "^12.3.3",
     "probot-config": "^1.1.0",
     "probot-scheduler": "wei/probot-scheduler#3b656f7",
     "request": "^2.88.2",