Bump Laravel to 13.8 in CI

Author: fulopattila122

.github/workflows/tests.yml

@@ -15,7 +15,7 @@ jobs:
     strategy:
       matrix:
         php: [ '8.3', '8.4', '8.5' ]
-        laravel: [ '11.46', '11.51', '12.50', '12.56', '13.2', '13.5' ]
+        laravel: [ '11.46', '11.51', '12.50', '12.56', '13.2', '13.8' ]
     name: PHP ${{ matrix.php }} Laravel ${{ matrix.laravel }}
     steps:
       - name: Checkout