fix(deps): update dependency @octokit/rest to v20

Author: renovate[bot]

packages/core/package.json

@@ -9,7 +9,7 @@
     "build": "tsc"
   },
   "dependencies": {
-    "@octokit/rest": "16.33.1",
+    "@octokit/rest": "20.0.1",
     "debug": "4.1.1",
     "env-ci": "4.5.2"
   },