fix: remove unused rimraf dependency

Author: gameroman

core/packages/gax/package.json

@@ -19,8 +19,7 @@
     "object-hash": "^3.0.0",
     "proto3-json-serializer": "3.0.4",
     "protobufjs": "^7.5.4",
-    "retry-request": "^8.0.2",
-    "rimraf": "^5.0.1"
+    "retry-request": "^8.0.2"
   },
   "devDependencies": {
     "@babel/plugin-proposal-private-methods": "^7.18.6",