Merge pull request #9673 from nextcloud/dependabot/composer/build/integration/guzzlehttp/guzzle-6.3.3

Update guzzlehttp/guzzle requirement to 6.3.3 in /build/integration

build/integration/composer.json

@@ -2,7 +2,7 @@
   "require-dev": {
     "phpunit/phpunit": "~4.6",
     "behat/behat": "^3.0",
-    "guzzlehttp/guzzle": "6.3.0",
+    "guzzlehttp/guzzle": "6.3.3",
     "jarnaiz/behat-junit-formatter": "^1.3",
     "sabre/dav": "3.2.2"
   }