feat: add Laravel 12 support

Add illuminate/contracts ^12.0 constraint to enable compatibility with
Laravel 12.x framework while maintaining backward compatibility with
Laravel 9, 10, and 11.

This preserves the custom semicolon fix for schema dumps (commit a94c0d4)
which is not present in upstream ylsideas/cockroachdb-laravel.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: Luca Critelli

composer.json

@@ -19,7 +19,7 @@
     "require": {
         "php": "^8.2",
         "spatie/laravel-package-tools": "^1.9.2",
-        "illuminate/contracts": "11.*|10.*|9.*"
+        "illuminate/contracts": "12.*|11.*|10.*|9.*"
     },
     "require-dev": {
         "doctrine/dbal": "^3.2",