Remove unecesary ext-json dependency (#2031)

Author: jderusse

CHANGELOG.md

@@ -6,6 +6,10 @@
 
 - AWS api-change: This change supports the creation of multi-account global tables. It adds two new arguments to CreateTable, GlobalTableSourceArn and GlobalTableSettingsReplicationMode. DescribeTable is also updated to include information about GlobalTableSettingsReplicationMode.
 
+### Changed
+
+- Remove redundant ext-json requirement
+
 ## 3.9.0
 
 ### Added

composer.json

@@ -13,7 +13,6 @@
     "require": {
         "php": "^8.2",
         "ext-filter": "*",
-        "ext-json": "*",
         "async-aws/core": "^1.16",
         "symfony/polyfill-uuid": "^1.13.1"
     },