Add Laravel 13 to test matrix

Author: marcorieser

.github/workflows/test.yml

@@ -10,7 +10,7 @@ jobs:
     strategy:
       matrix:
         php: [8.3, 8.4]
-        laravel: [11.*, 12.*]
+        laravel: [11.*, 12.*, 13.*]
         stability: [prefer-lowest, prefer-stable]
         os: [ubuntu-latest]
         dependency-version: [prefer-stable]