[ci] add json to composer require checker json

TomasVotruba · ondrejmirtes · commit 8748e9c830fa · 2022-05-03T17:56:35.000+02:00
diff --git a/build/composer-require-checker.json b/build/composer-require-checker.json
@@ -12,6 +12,7 @@
 	  "Clue\\React\\Block\\await", "Hoa\\File\\Read"
   ],
   "php-core-extensions" : [
+    "json",
     "Core",
     "date",
     "pcre",
