Upgrade php to v8.3 with rector

src/Bundle/ChillActivityBundle/DependencyInjection/ChillActivityExtension.php

@@ -25,6 +25,7 @@ use Symfony\Component\HttpKernel\DependencyInjection\Extension;
  */
 class ChillActivityExtension extends Extension implements PrependExtensionInterface
 {
+    #[\Override]
     public function load(array $configs, ContainerBuilder $container)
     {
         $configuration = new Configuration();
@@ -44,6 +45,7 @@ class ChillActivityExtension extends Extension implements PrependExtensionInterf
         $loader->load('services/doctrine.entitylistener.yaml');
     }
 
+    #[\Override]
     public function prepend(ContainerBuilder $container)
     {
         $this->prependRoutes($container);

src/Bundle/ChillActivityBundle/DependencyInjection/Configuration.php

@@ -22,6 +22,7 @@ use function is_int;
  */
 class Configuration implements ConfigurationInterface
 {
+    #[\Override]
     public function getConfigTreeBuilder()
     {
         $treeBuilder = new TreeBuilder('chill_activity');