Bump phpcs dependency to fix deprecation notice on PHP 8.1

Author: TiiFuchs

composer.json

@@ -39,7 +39,7 @@
     },
     "require-dev": {
         "phpunit/phpunit": "^9.5",
-        "squizlabs/php_codesniffer": "^3.5",
+        "squizlabs/php_codesniffer": "^3.6",
         "dms/phpunit-arraysubset-asserts": "^0.2",
         "monolog/monolog": "^2.1"
     },