Update dependency squizlabs/php_codesniffer to v3.12.1

Author: renovate[bot]

composer.json

@@ -29,7 +29,7 @@
   },
   "require-dev": {
     "phpunit/phpunit": "9.5.9",
-    "squizlabs/php_codesniffer": "3.6.0",
+    "squizlabs/php_codesniffer": "3.12.1",
     "php-coveralls/php-coveralls": "2.4.3",
     "vimeo/psalm": "4.10.0",
     "jetbrains/phpstorm-stubs": "dev-master"