validator functions not recognized as classmethods for dataclasses

[igorbga]

Describe the bug
If I use a @validator decorator in a Pydantic regular model Pycharm does not complain about first parameter being called "cls", but if instead I use a Pydantic dataclass it complains

To Reproduce

from pydantic.dataclasses import dataclass

@dataclass(frozen=True)
class MyValueObject:
    value: str

    @validator('value')
    def _value_validator(cls, value):
        return value

Expected behavior
I would expect it not to complain about "cls" as it already does for BaseModels

Environments (please complete the following information):

• IDE: PyCharm Community 2021.3.3
• OS: Ubuntu 18.03
• Pydantic Version 1.9.0
• Plugin version 0.3.12

[koxudaxi]

@igorbga
I'm sorry for my too-late reply.
The fixed version has been released.
Thank you very much.