fix: ignore mix type to avoid false positive

Author: hirokinoue

Rules/NameNodeHolderFindRule.php

@@ -8,6 +8,7 @@
 use PHPStan\Node\InClassNode;
 use PHPStan\Rules\RuleErrorBuilder;
 use PHPStan\Type\ArrayType;
+use PHPStan\Type\MixedType;
 use PHPStan\Type\ObjectType;
 
 class NameNodeHolderFindRule implements Rule
@@ -34,6 +35,9 @@ public function processNode(Node $node, Scope $scope): array
                 if ($propertyType instanceof ArrayType) {
                     $propertyType = $propertyType->getItemType();
                 }
+                if ($propertyType instanceof MixedType) {
+                    continue;
+                }
                 $trinary = $propertyType->isSuperTypeOf(new ObjectType('PhpParser\Node\Name'));
                 if (!$trinary->no()) {
                     return [