Update GitHub Actions for Laravel 12

Author: laravel-shift

.github/workflows/run-tests.yml

@@ -12,7 +12,7 @@ jobs:
       matrix:
         os: [ubuntu-latest]
         php: [8.2]
-        laravel: ['10.*', '11.*']
+        laravel: ['10.*', '11.*', '12.*']
         stability: [prefer-lowest, prefer-stable]
 
     name: PHP ${{ matrix.php }} - Laravel ${{ matrix.laravel }} - ${{ matrix.stability }} - ${{ matrix.os }}