fix(deps): update dependency google/cloud-pubsub to ^0.6.2 || ^0.12.0

Author: renovate-bot

toolkit/benchmark/clients/php/composer.json

@@ -1,6 +1,6 @@
 {
     "require": {
-        "google/cloud-pubsub": "^0.6.2",
+        "google/cloud-pubsub": "^0.6.2 || ^0.12.0",
         "google/gax": "^0.23.0",
         "google/proto-client": "^0.23.0"
     }