Test on PHP 8.4

Author: stevebauman

.github/workflows/run-tests.yml

@@ -15,7 +15,7 @@ jobs:
             fail-fast: false
             matrix:
                 os: [ubuntu-latest, windows-latest]
-                php: [8.1, 8.2, 8.3]
+                php: [8.1, 8.2, 8.3, 8.4]
 
         steps:
             - name: Checkout code