Update composer.json

Author: dbu

composer.json

@@ -18,7 +18,7 @@
     },
     "require-dev": {
         "friendsofphp/php-cs-fixer": "^3.51",
-        "php-http/client-integration-tests": "3.0.1",
+        "php-http/client-integration-tests": "^3.1.1",
         "php-http/message": "^1.16",
         "php-http/client-common": "^2.7",
         "phpunit/phpunit": "^8.5.23 || ~9.5",