Updated trace message in DictType error messages on values

Co-authored-by: Saif Eddin Gmati <29315886+azjezz@users.noreply.github.com>

src/Psl/Type/Internal/DictType.php

@@ -84,7 +84,7 @@ public function assert(mixed $value): array
             $trace->withFrame('dict<' . $this->key_type->toString() . ', _>')
         );
         $value_type = $this->value_type->withTrace(
-            $trace->withFrame('dict<_, ' . $this->value_type->toString() . ', _>')
+            $trace->withFrame('dict<_, ' . $this->value_type->toString() . '>')
         );
 
         $result = [];