Bump shipmonk/coding-standard to ^0.3.0

Re-point from the dev branch to the released tag now that the custom
sniffs have been merged and tagged.

Co-Authored-By: Claude Code
Claude-Session: https://claude.ai/code/session_01UmPfEJbugfzcEJ3Xa2rsjq

Author: janedbal

composer.json

@@ -35,7 +35,7 @@
         "phpstan/phpstan-symfony": "^2.0.15",
         "phpunit/phpcov": "^9.0.2",
         "phpunit/phpunit": "^10.5.46",
-        "shipmonk/coding-standard": "dev-add-generic-custom-sniffs",
+        "shipmonk/coding-standard": "^0.3.0",
         "shipmonk/composer-dependency-analyser": "^1.8.4",
         "shipmonk/coverage-guard": "^1.0.2",
         "shipmonk/name-collision-detector": "^2.1.1",