phpcs update to version 3.7.0 to ensure it catches all the PHP 8.1 updates

Author: MarkBaker

composer.json

@@ -87,7 +87,7 @@
         "phpstan/phpstan": "^1.1",
         "phpstan/phpstan-phpunit": "^1.0",
         "phpunit/phpunit": "^8.5 || ^9.0",
-        "squizlabs/php_codesniffer": "^3.6",
+        "squizlabs/php_codesniffer": "^3.7",
         "tecnickcom/tcpdf": "^6.4"
     },
     "suggest": {