Update workflow to use php-8.4

Author: NeoIsRecursive

.github/workflows/run-tests.yml

@@ -19,7 +19,7 @@ jobs:
       - name: Setup PHP with PECL extension
         uses: shivammathur/setup-php@v2
         with:
-          php-version: "8.3"
+          php-version: "8.4"
           coverage: xdebug
 
       - name: Validate composer.json and composer.lock