Upgrade PHP version from 8.3 to 8.4

Author: driesvints

.github/workflows/tests.yml

@@ -27,7 +27,7 @@ jobs:
       - name: Setup PHP
         uses: shivammathur/setup-php@v2
         with:
-          php-version: 8.3
+          php-version: 8.4
           extensions: dom, curl, libxml, mbstring, zip, pcntl, pdo, sqlite, pdo_sqlite, gd
           coverage: none