Update dependency unleashedtech/php-coding-standard to v3 (#230)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

composer.json

@@ -39,7 +39,7 @@
         "phpstan/phpstan": "^1.8.8",
         "phpunit/phpunit": "^8.5 || ^9.2",
         "scrutinizer/ocular": "^1.6",
-        "unleashedtech/php-coding-standard": "^2.7",
+        "unleashedtech/php-coding-standard": "^2.7 || ^3.0",
         "vimeo/psalm": "^4.22"
     },
     "bin": ["bin/html-to-markdown"],