fix(#343): remove unnecessary ext-json from dependencies (#344)

Author: jbonnier

composer.json

@@ -6,7 +6,6 @@
     "minimum-stability": "dev",
     "require": {
         "php": ">=8.1.10",
-        "ext-json": "*",
         "symfony/config": "^5.4 | ^6.0 | ^7.0",
         "symfony/dependency-injection": "^5.4 | ^6.0 | ^7.0",
         "symfony/deprecation-contracts": "^2.2 | ^3.0",