chore(deps): update dependency google/cloud-error-reporting to ^0.18.0 (GoogleCloudPlatform#1169)

Author: renovate-bot

appengine/php72/errorreporting/composer.json

@@ -1,5 +1,5 @@
 {
     "require": {
-        "google/cloud-error-reporting": "^0.17.0"
+        "google/cloud-error-reporting": "^0.18.0"
     }
 }

error_reporting/composer.json

@@ -1,5 +1,5 @@
 {
     "require": {
-        "google/cloud-error-reporting": "^0.17.0"
+        "google/cloud-error-reporting": "^0.18.0"
     }
 }