Remove squizlabs/php_codesniffer from composer dev-requirements

Author: gregor-j

composer.json

@@ -38,8 +38,7 @@
   "require-dev": {
     "ext-json": "*",
     "phpunit/phpunit": "^9.6",
-    "php-sap/integration-tests": "^7.0",
-    "squizlabs/php_codesniffer": "^3.7"
+    "php-sap/integration-tests": "^7.0"
   },
   "autoload": {
     "psr-4": {