Revert "js-executor: upgraded libraries to fix vulnerability warning (@google-cloud/pubsub", amqplib)"

Untested version with breaking changes declared
This reverts commit 80f83a86

msa/js-executor/package.json

@@ -13,8 +13,8 @@
   },
   "dependencies": {
     "@azure/service-bus": "^1.1.9",
-    "@google-cloud/pubsub": "^2.12.0",
-    "amqplib": "^0.8.0",
+    "@google-cloud/pubsub": "^2.5.0",
+    "amqplib": "^0.6.0",
     "aws-sdk": "^2.741.0",
     "azure-sb": "^0.11.1",
     "config": "^3.3.1",