Fix class Data(Protocol) types declaration (Again!)

[lsantric]

Related to #276

This produced errors in pyright:

class Data(Protocol):
    def keys(self): ...
    def __getitem__(self, item): ...
    def __contains__(self, item): ...

Was fixed in pr #278 to:

class Data(Protocol):
    def keys(self) -> Any: ...
    def __getitem__(self, *args, **kwargs) -> Any: ...
    def __contains__(self, *args, **kwargs) -> bool: ...

But this produces warnings in pycharm so i recommend:

class Data(Protocol):
    def keys(self) -> Any: ...
    def __getitem__(self, __key, /) -> Any: ...
    def __contains__(self, __x, /) -> bool: ...

Seems to be compatible with mypy, black, pyright and pycharm.