Fix incorrect argument type in answer_pre_checkout_query()

[Relecto]

Hi!
Noticed a typing mistake, it should be fairly easy to fix :)

As per the documentation, in answer_pre_checkout_query method, pre_checkout_query_id should be str, not int - https://core.telegram.org/bots/api#answerprecheckoutquery

Description

Correct type in answer_pre_checkout_query() method signature

Describe your tests

Pycharm does not show type warning anymore :)

Python version: 3.12

OS: MacOS, Debian

Checklist:

• I added/edited example on new feature/change (if exists)
• My changes won't break backward compatibility
• I made changes both for sync and async

[Badiboy]

Thank you.