Remove dependency on php-http/message-factory

Author: nicolas-grekas

composer.json

@@ -14,7 +14,6 @@
         "php": "^7.1 || ^8.0",
         "php-http/httplug": "^2.0",
         "php-http/message": "^1.6",
-        "php-http/message-factory": "^1.0",
         "psr/http-client": "^1.0",
         "psr/http-factory": "^1.0",
         "psr/http-message": "^1.0 || ^2.0",