bug symfony#52597 [DependencyInjection] Fix dumping containers with null-referenced services (nicolas-grekas)

This PR was merged into the 7.0 branch.

Discussion
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[DependencyInjection] Fix dumping containers with null-referenced services

| Q             | A
| ------------- | ---
| Branch?       | 7.0
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Issues        | Fix symfony#52596
| License       | MIT

Commits
-------

89f71ab [DependencyInjection] Fix dumping containers with null-referenced services

Author: nicolas-grekas

src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php

@@ -243,6 +243,7 @@ public function dump(array $options = []): string|array
 <?php
 
 use Symfony\Component\DependencyInjection\Argument\RewindableGenerator;
+use Symfony\Component\DependencyInjection\ContainerInterface;
 use Symfony\Component\DependencyInjection\Exception\RuntimeException;
 
 /*{$this->docStar}

src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services10_as_files.txt

@@ -13,6 +13,7 @@ return [
 namespace Container%s;
 
 use Symfony\Component\DependencyInjection\Argument\RewindableGenerator;
+use Symfony\Component\DependencyInjection\ContainerInterface;
 use Symfony\Component\DependencyInjection\Exception\RuntimeException;
 
 /**

src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services9_as_files.txt

@@ -23,6 +23,7 @@ return [
 namespace Container%s;
 
 use Symfony\Component\DependencyInjection\Argument\RewindableGenerator;
+use Symfony\Component\DependencyInjection\ContainerInterface;
 use Symfony\Component\DependencyInjection\Exception\RuntimeException;
 
 /**

src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_deprecated_parameters_as_files.txt

@@ -5,6 +5,7 @@ Array
 namespace Container%s;
 
 use Symfony\Component\DependencyInjection\Argument\RewindableGenerator;
+use Symfony\Component\DependencyInjection\ContainerInterface;
 use Symfony\Component\DependencyInjection\Exception\RuntimeException;
 
 /**

src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_non_shared_lazy_as_files.txt

@@ -5,6 +5,7 @@ Array
 namespace Container%s;
 
 use Symfony\Component\DependencyInjection\Argument\RewindableGenerator;
+use Symfony\Component\DependencyInjection\ContainerInterface;
 use Symfony\Component\DependencyInjection\Exception\RuntimeException;
 
 /**