update dev-deps order

Author: Joel Butcher

composer.json

@@ -25,8 +25,8 @@
     },
     "require-dev": {
         "mockery/mockery": "^1.0",
-        "phpunit/phpunit": "^9.3",
-        "php-http/guzzle6-adapter": "^1.0"
+        "php-http/guzzle6-adapter": "^1.0",
+        "phpunit/phpunit": "^9.3"
     },
     "autoload": {
         "psr-4": {