chore: remove unneeded extension

Author: recanman

composer.json

@@ -31,7 +31,6 @@
     "require": {
         "php": "^8.1.0",
         "ext-bcmath": "*",
-        "ext-json": "*",
         "kornrunner/keccak": "^1.1"
     },
     "require-dev": {