chore: add testruns for PHP 8.4

Author: Chris53897

.github/workflows/tests.yml

@@ -12,7 +12,7 @@ jobs:
       matrix:
         # Symfony 6.4 requires PHP >= 8.0, it will be installed on PHP >= 8.0
         # Symfony 7.0 requires PHP >= 8.2, it will be installed on PHP >= 8.2
-        php-version: ['8.1', '8.2', '8.3']
+        php-version: ['8.1', '8.2', '8.3', '8.4']
         composer-flags: ['']
         symfony-version: ['^6.4']
         phpunit-version: ['^9.6']
@@ -45,6 +45,9 @@ jobs:
           - php-version: 8.3
             symfony-version: "^7.0"
             phpunit-version: "^11.0"
+          - php-version: 8.4
+            symfony-version: "^7.0"
+            phpunit-version: "^11.0"
 
     steps:
       - name: Checkout