Update rector/rector requirement from 2.5.4 to 2.5.6

[dependabot]

Updates the requirements on rector/rector to permit the latest version.

Release notes

Sourced from rector/rector's releases.

Released Rector 2.5.6

New Features 🥳

• [DeadCode] Add RemoveReturnTagIncompatibleWithNativeTypeRector (#8172)

 final class SomeClass
 {
-    /**
-     * @return SomeObject
-     */
     public function getName(): string
     {
         return $this->someObject->getName();
     }
 }

• [TypeDeclarationDocblocks] Add MergePhpstanDocTagIntoNativeRector to merge @phpstan-* doc tags into native tags (#8171)

 final class SomeClass
 {
     /**
-     * @var Collection
-     *
-     * @phpstan-var Collection<int, string>
+     * @var Collection<int, string>
      */
     private $items;
 }

Bugfixes 🐛

• [Php81] Skip array dim fetch args in NullToStrictStringFuncCallArgRector (#8164)
• Fix scoper to clean up prefix under getRuleDefinition() method, parts 1–5 (#8165, #8166, #8167, #8168, #8169)
• Bump phpstan/phpdoc-parser to ^2.3.3 (#8174)

---

PHPUnit 🧪

New rules and changes from rector-phpunit.

New Rules

• [CodeQuality] Add AssertClassToThisAssertRector (#707)

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Commits

• c329e21 Rector 2.5.6
• 378ed80 Updated Rector to commit 00a3fea7fd88a82ef882f9535cd86ee6756ae457
• 0d7541c Updated Rector to commit da47b6934093716fffa3ebbc4998b0318fd68165
• ddadd36 Updated Rector to commit d9882563d2ce16cd6f59924d02c82093869cb860
• e314e50 Updated Rector to commit 15ecbd6ebfe4067ce54013c039f98cd20d65de9b
• e36efb4 Updated Rector to commit d9f0339b3c8beeb05962008d41e10817090ef738
• 4d0da8a Updated Rector to commit d67958f43889b5ef913356f9c24004ee53361235
• d3aead9 Updated Rector to commit 6cdd31762b88d827c8d42a682ced64d66d3c2cb0
• f45099a Updated Rector to commit 244959691ed87bf526f44381042ababcf648fd79
• d54cae3 Updated Rector to commit 67276abc57fb7f03aec34b66fce72b53aebeb645
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