Adding PHP 8.4 to the tests matrix (laravel#6516)

Author: mathiasgrimm

.github/workflows/tests.yml

@@ -19,7 +19,7 @@ jobs:
     strategy:
       fail-fast: true
       matrix:
-        php: [8.2, 8.3]
+        php: [8.2, 8.3, 8.4]
 
     name: PHP ${{ matrix.php }}