Update sniffs to PHPCS v4.

Author: dereuromark

composer.json

@@ -14,7 +14,6 @@
 	"require": {
 		"php": ">=8.1",
 		"php-collective/code-sniffer": "dev-next",
-		"slevomat/coding-standard": "dev-phpcs4",
 		"squizlabs/php_codesniffer": "^4.0.0"
 	},
 	"require-dev": {