update probot to v9

Author: mfix22

package.json

@@ -21,7 +21,7 @@
     "bee-queue": "^1.2.2",
     "moment": "^2.24.0",
     "ms": "^2.1.1",
-    "probot": "^7.5.0",
+    "probot": "^9.0.0",
     "smee-client": "^1.0.1"
   },
   "devDependencies": {