Bump phpdocumentor/reflection-docblock from 5.5.1 to 5.6.1

Bumps [phpdocumentor/reflection-docblock](https://github.com/phpDocumentor/ReflectionDocBlock) from 5.5.1 to 5.6.1.
- [Release notes](https://github.com/phpDocumentor/ReflectionDocBlock/releases)
- [Commits](phpDocumentor/ReflectionDocBlock@5.5.1...5.6.1)

---
updated-dependencies:
- dependency-name: phpdocumentor/reflection-docblock
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

composer.json

@@ -27,7 +27,7 @@
         "friendsofphp/php-cs-fixer": "^3.9",
         "nanasess/ec-cube2-class-extends-stubs": "^1.0",
         "nanasess/eccube2-fixture-generator": "^2.0",
-        "phpdocumentor/reflection-docblock": "~5.5.1",
+        "phpdocumentor/reflection-docblock": "~5.6.1",
         "phpstan/phpstan": "^2.0",
         "phpunit/phpunit": "^9.6",
         "symfony/yaml": "^5.4 || ^6.4"