ci: Test on PHP 8.4

Author: cmfcmf

.github/workflows/main.yml

@@ -33,6 +33,9 @@ jobs:
         - php-versions: '8.3'
           phpunit-version: '9.5.27'
           experimental: false
+        - php-versions: '8.4'
+          phpunit-version: '9.5.27'
+          experimental: false
     steps:
     - name: Checkout
       uses: actions/checkout@v4