Can not to use relation to table with unsigned pk

[mixartemev]

Describe the bug

pydantic_core._pydantic_core.ValidationError: 1 validation error for ListItem
msg.chat_id
  Input should be greater than or equal to 1 [type=greater_than_equal, input_value=-1001294902609, input_type=int]
    For further information visit https://errors.pydantic.dev/2.7/v/greater_than_equal

To Reproduce
Just to have negative values in PK field of related table

Expected behavior
Do not get validation error

Additional context
Cause: constraint ge is reseting to 1 for relational field (where self.reference is not None)

tortoise-orm/tortoise/fields/data.py

Line 123 in 345af17

"ge": 1 if self.generated or self.reference else -9223372036854775808,

[abondar]

Yeah, it's a little bit problematic

Probably should just delete dynamic lower bound, as we don't enforce it anyhow on db level
Will remove it in next version

[abondar]

Should be fixed in 0.21.0, now int fields are always signed