In python 3.10 you can use slots=True when applying the dataclasses decorator

see https://docs.python.org/3.10/whatsnew/3.10.html#slots

from dataclasses import dataclass

@dataclass(slots=True)
class Birthday:
    name: str
    birthday: datetime.date

we should think about whether we expose this to end users, like so:

import strawberry

@strawberry.type(slots=True)
class Birthday:
    name: str
    birthday: datetime.date

or if we enable it automatically (but we should still allow to disable it if that's the case)