bug #62437 [DependencyInjection] Fix preloading LazyClosure (nicolas-grekas)

This PR was merged into the 6.4 branch.

Discussion
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[DependencyInjection] Fix preloading `LazyClosure`

| Q             | A
| ------------- | ---
| Branch?       | 6.4
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Issues        | -
| License       | MIT

Fixes this PHP warning when preloading a container that uses a lazy-closure:

> Can't preload unlinked class Symfony\Component\DependencyInjection\Argument\LazyClosure@anonymous: Unknown parent Symfony\Component\DependencyInjection\Argument\LazyClosure

Commits
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5baca4c [DependencyInjection] Fix preloading LazyClosure

Author: fabpot

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

@@ -1208,6 +1208,7 @@ private function addNewInstance(Definition $definition, string $return = '', ?st
                 || ($callable[0] instanceof Definition && !$this->definitionVariables->offsetExists($callable[0]))
             ))) {
                 $initializer = 'fn () => '.$this->dumpValue($callable[0]);
+                $this->preload[LazyClosure::class] = LazyClosure::class;
 
                 return $return.LazyClosure::getCode($initializer, $callable, $class, $this->container, $id).$tail;
             }