Update dependency symplify/coding-standard to v7.2.8

Author: renovate-bot

composer.json

@@ -11,7 +11,7 @@
     ],
     "require": {
         "squizlabs/php_codesniffer": "3.5.2",
-        "symplify/coding-standard": "7.2.2"
+        "symplify/coding-standard": "7.2.8"
     },
     "autoload": {
         "psr-4": {