Use PHP 8.4 for the PHP 7.4 integration test

Author: nikic

.github/workflows/main.yml

@@ -56,15 +56,15 @@ jobs:
         run: "php vendor/bin/phpunit"
   test_old_73_80:
     runs-on: "ubuntu-latest"
-    name: "PHP 7.4 Code on PHP 8.3 Integration Tests"
+    name: "PHP 7.4 Code on PHP 8.4 Integration Tests"
     steps:
       - name: "Checkout"
         uses: "actions/checkout@v4"
       - name: "Install PHP"
         uses: "shivammathur/setup-php@v2"
         with:
           coverage: "none"
-          php-version: "8.3"
+          php-version: "8.4"
           ini-file: "development"
           tools: composer:v2
       - name: "Install PHP 8 dependencies"