fix: Add return type for Symfony 7 compatibility

- Add TreeBuilder return type to getConfigTreeBuilder()

Author: Refaat-alktifan

src/DependencyInjection/Configuration.php

@@ -23,7 +23,7 @@
 
 class Configuration implements ConfigurationInterface
 {
-    public function getConfigTreeBuilder()
+    public function getConfigTreeBuilder(): TreeBuilder
     {
         $treeBuilder = new TreeBuilder('form_builder');
         $rootNode = $treeBuilder->getRootNode();