fix(deps): update dependency @google-cloud/pubsub to ^0.23.0 (#583)

Author: renovate[bot]

package.json

@@ -70,7 +70,7 @@
   },
   "devDependencies": {
     "@google-cloud/nodejs-repo-tools": "^3.0.0",
-    "@google-cloud/pubsub": "^0.22.0",
+    "@google-cloud/pubsub": "^0.23.0",
     "@types/arrify": "^1.0.4",
     "@types/async": "^2.0.49",
     "@types/compressible": "^2.0.0",

samples/package.json

@@ -16,7 +16,7 @@
     "test": "mocha system-test/*.js --timeout 600000"
   },
   "dependencies": {
-    "@google-cloud/pubsub": "^0.22.2",
+    "@google-cloud/pubsub": "^0.23.0",
     "@google-cloud/storage": "^2.3.4",
     "uuid": "^3.3.2",
     "yargs": "^12.0.0"