[DependencyInjection] Fix missing binding for ServiceCollectionInterface when declaring a service subscriber

Author: nicolas-grekas

Compiler/RegisterServiceSubscribersPass.php

@@ -20,6 +20,7 @@
 use Symfony\Component\DependencyInjection\Reference;
 use Symfony\Component\DependencyInjection\TypedReference;
 use Symfony\Contracts\Service\Attribute\SubscribedService;
+use Symfony\Contracts\Service\ServiceCollectionInterface;
 use Symfony\Contracts\Service\ServiceProviderInterface;
 use Symfony\Contracts\Service\ServiceSubscriberInterface;
 
@@ -134,6 +135,7 @@ protected function processValue(mixed $value, bool $isRoot = false): mixed
         $value->setBindings([
             PsrContainerInterface::class => new BoundArgument($locatorRef, false),
             ServiceProviderInterface::class => new BoundArgument($locatorRef, false),
+            ServiceCollectionInterface::class => new BoundArgument($locatorRef, false),
         ] + $value->getBindings());
 
         return parent::processValue($value);