Add Laravel 12 support. (#25)

* Add support for Laravel 12.

Author: hailwood

.github/workflows/phpstan.yml

@@ -16,7 +16,7 @@ jobs:
       - name: Setup PHP
         uses: shivammathur/setup-php@v2
         with:
-          php-version: '8.1'
+          php-version: '8.3'
           coverage: none
 
       - name: Install composer dependencies

.github/workflows/run-tests.yml

@@ -21,7 +21,7 @@
     "require": {
         "php": "^8.2",
         "spatie/laravel-package-tools": "^1.14.0",
-        "illuminate/contracts": "^11.0"
+        "illuminate/contracts": "^11.0|^12.0"
     },
     "require-dev": {
         "inertiajs/inertia-laravel": "<2",