minor #39714 fix code style (xabbuh)

This PR was merged into the 5.1 branch.

Discussion
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fix code style

| Q             | A
| ------------- | ---
| Branch?       | 5.1
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Tickets       |
| License       | MIT
| Doc PR        |

Commits
-------

08fb696dbc fix code style

Author: xabbuh

Dumper/PhpDumper.php

@@ -21,7 +21,6 @@
 use Symfony\Component\DependencyInjection\Argument\ServiceLocatorArgument;
 use Symfony\Component\DependencyInjection\Compiler\AnalyzeServiceReferencesPass;
 use Symfony\Component\DependencyInjection\Compiler\CheckCircularReferencesPass;
-use Symfony\Component\DependencyInjection\Compiler\ServiceReferenceGraphEdge;
 use Symfony\Component\DependencyInjection\Compiler\ServiceReferenceGraphNode;
 use Symfony\Component\DependencyInjection\Container;
 use Symfony\Component\DependencyInjection\ContainerBuilder;