Add return types preventitavely

Author: MKodde

src/DependencyInjection/Compiler/HealthCheckPass.php

@@ -30,7 +30,7 @@ class HealthCheckPass implements CompilerPassInterface
     /**
      * @SuppressWarnings(PHPMD.UnusedLocalVariable) $tags is never used in the foreach
      */
-    public function process(ContainerBuilder $container)
+    public function process(ContainerBuilder $container): void
     {
         if (!$container->has('openconext.monitor.health_check_chain')) {
             return;

src/DependencyInjection/OpenConextMonitorExtension.php

@@ -34,7 +34,7 @@ class OpenConextMonitorExtension extends Extension
     /**
      * @throws \Exception
      */
-    public function load(array $configs, ContainerBuilder $container)
+    public function load(array $configs, ContainerBuilder $container): void
     {
         $loader = new Loader\YamlFileLoader($container, new FileLocator(__DIR__ . '/../Resources/config'));
         $loader->load('services.yml');