chore(deps): update dependency guzzlehttp/guzzle to ~6.5.0 (GoogleCloudPlatform#1060)

Author: renovate-bot

appengine/flexible/mailjet/composer.json

@@ -2,7 +2,7 @@
     "require": {
         "silex/silex": "^2.3",
         "mailjet/mailjet-apiv3-php": "^1.1",
-        "guzzlehttp/guzzle": "~6.1.0"
+        "guzzlehttp/guzzle": "~6.5.0"
     },
     "require-dev": {
         "symfony/browser-kit": "^3.0",

iap/composer.json

@@ -2,7 +2,7 @@
     "require": {
         "symfony/console": "^2.8",
         "google/auth":"^1.8.0",
-        "guzzlehttp/guzzle": "~6.3.3",
+        "guzzlehttp/guzzle": "~6.5.0",
         "kelvinmo/simplejwt": "^0.2.4"
     },
     "autoload": {