Update dependency squizlabs/php_codesniffer to v4

Author: renovate-bot

private-captcha/composer.json

@@ -9,7 +9,7 @@
     "require-dev": {
         "phpstan/phpstan": "^1.0",
         "wp-coding-standards/wpcs": "^3.0",
-        "squizlabs/php_codesniffer": "^3.0",
+        "squizlabs/php_codesniffer": "^4.0",
         "dealerdirect/phpcodesniffer-composer-installer": "^1.0",
         "szepeviktor/phpstan-wordpress": "^1.3"
     },