Run tests on PHP 8.4 and update test environment

Author: PaulRotmann

.github/workflows/ci.yml

@@ -11,9 +11,11 @@ jobs:
     strategy:
       matrix:
         os:
-          - ubuntu-22.04
+          - ubuntu-24.04
           - windows-2022
         php:
+          - 8.4
+          - 8.3
           - 8.2
           - 8.1
           - 8.0