Add ci job for PHP 8.4

Author: W0rma

.github/workflows/continuous-integration.yml

@@ -14,6 +14,6 @@ jobs:
     name: "PHPUnit"
     uses: "doctrine/.github/.github/workflows/[email protected]"
     with:
-      php-versions: '["8.1", "8.2", "8.3"]'
+      php-versions: '["8.1", "8.2", "8.3", "8.4"]'
     secrets:
       CODECOV_TOKEN: "${{ secrets.CODECOV_TOKEN }}"