Fix compatibility with latest phpstan patch 2.1.x-dev (#7997)

Author: samsonasik

rules/TypeDeclaration/Rector/ArrowFunction/AddArrowFunctionReturnTypeRector.php

@@ -5,6 +5,7 @@
 namespace Rector\TypeDeclaration\Rector\ArrowFunction;
 
 use PhpParser\Node;
+use PhpParser\Node\Expr\ArrayDimFetch;
 use PhpParser\Node\Expr\ArrowFunction;
 use PHPStan\Type\MixedType;
 use PHPStan\Type\NullType;
@@ -58,7 +59,10 @@ public function refactor(Node $node): ?Node
             return null;
         }
 
-        $type = $this->nodeTypeResolver->getNativeType($node->expr);
+        // to allow array shape
+        $type = $node->expr instanceof ArrayDimFetch
+            ? $this->getType($node->expr)
+            : $this->nodeTypeResolver->getNativeType($node->expr);
 
         // not valid to add explicit type in PHP
         if ($type->isVoid()->yes()) {