update guzzle version to 7.2.x

Author: kemalnw

composer.json

@@ -10,7 +10,7 @@
     ],
     "require": {
         "php": "^7.2",
-        "guzzlehttp/guzzle": "~6.3",
+        "guzzlehttp/guzzle": "^7.2",
         "illuminate/notifications": "^5.5|^6.0|^7.0|^8.0",
         "illuminate/support": "^5.5|^6.0|^7.0|^8.0"
     },