Update dependency squizlabs/php_codesniffer to v3.7.1

Author: renovate[bot]

composer.json

@@ -28,7 +28,7 @@
     },
     "require-dev": {
         "phpunit/phpunit": "9.2.6",
-        "squizlabs/php_codesniffer": "*",
+        "squizlabs/php_codesniffer": "3.7.1",
         "phpcompatibility/php-compatibility": "*",
         "dealerdirect/phpcodesniffer-composer-installer": "*",
         "ext-xdebug": "*",