Update minimum garden-http version (#9)

Author: OlivierLamyCanuel

composer.json

@@ -25,7 +25,7 @@
         }
     ],
     "require": {
-        "vanilla/garden-http": "^2.8",
+        "vanilla/garden-http": "^3.0",
         "psr/http-message": "^1.0.1",
         "ext-json": "*",
         "php": ">=8.0",