Fix PHPStan for latest build

[samsonasik]

Fix notice:

  rules/AnnotationsToAttributes/Rector/Class_/AnnotationWithValueToAttributeRector.php:137
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  - '#Call to static method Webmozart\\Assert\\Assert\:\:isInstanceOf\(\) with PhpParser\\Node\\Stmt\\Class_ and 'PhpParser\\\\Node\\\\Stmt\\\\Class_' will always evaluate to true#'
  🪪 staticMethod.alreadyNarrowedType

[TomasVotruba]

👍