[CI] Remove all __getattr__(name) -> Any from *.pyi files before next release

[rok]

Describe the enhancement requested

__getattr__(name) -> Any from pyarrow/__init__.pyi will annotate even non-existing attributes with Any which is not desirable.

See here

Component(s)

Python

[raulcd]

@rok, this is marked as 24.0.0, I don't think this is going to be part of the release and doesn't seem like a blocker, I'll move it to 25.0.0 once I create the new milestone.