Exclude laravel 8.x tests from php 8.3

Author: rawilk

.github/workflows/run-tests.yml

@@ -37,6 +37,8 @@ jobs:
                     -   laravel: 8.*
                         php: 8.2
                         stability: prefer-lowest
+                    -   laravel: 8.*
+                        php: 8.3
                     -   laravel: 11.*
                         php: 8.1