🎨 Fix type annotation for ignore_errors in sentry_sdk.init().

This would be a valid example using Sentry:

from typing import List
import sentry_sdk


class BaseError(Exception):
    pass


class AuthError(BaseError):
    pass


class UserError(BaseError):
    pass


ignored_errors: list[type[BaseError]] = [AuthError, UserError]

sentry_sdk.init(dsn="notreallyadsn", ignore_errors=ignored_errors)

But mypy / type annotation tools would complain that it's not valid because "List is invariant", so it's much more strict about expecting the exact types and type parameters it defines.

Argument "ignore_errors" to "init" has incompatible type "List[type]"; expected "List[Union[type, str]]"  [arg-type]mypy(error)
"List" is invariant -- see https://mypy.readthedocs.io/en/stable/common_issues.html#variancemypy(note)
Consider using "Sequence" instead, which is covariantmypy(note)

After this change that error goes away.