adjust test matrix for laravel 12

Author: Sairahcaz

.github/workflows/run-tests.yml

@@ -20,6 +20,9 @@ jobs:
         laravel: ['8.*', '9.*', '10.*', '11.*', '12.*']
         stability: [prefer-lowest, prefer-stable]
         include:
+          - laravel: 12.*
+            testbench: 10.*
+            carbon: ^2.63
           - laravel: 11.*
             testbench: 9.*
             carbon: ^2.63