fix(deps): update dependency google/analytics-data to ^0.18.0 (GoogleCloudPlatform#2041)

Author: renovate-bot

analyticsdata/quickstart_oauth2/composer.json

@@ -1,6 +1,6 @@
 {
     "require": {
-        "google/analytics-data": "^0.17.0",
+        "google/analytics-data": "^0.18.0",
         "ext-bcmath":  "*"
     }
 }