Update dependency wyrihaximus/coding-standard to ^2.21.0

Author: renovate-runner[bot]

composer.json

@@ -27,7 +27,7 @@
     "rector/rector": "^2.1.4",
     "roave/backward-compatibility-check": "^8.14.0",
     "squizlabs/php_codesniffer": "^3.13.2",
-    "wyrihaximus/coding-standard": "^2.20.2",
+    "wyrihaximus/coding-standard": "^2.21.0",
     "wyrihaximus/phpstan-rules-wrapper": "^10.19.0"
   },
   "require-dev": {