Fix error import while having aiohttp installed

[mupastir]

#6 As it was fixed before the updates

There is minimal setup to reproduce:

(Install venv and activate it, as for me I use uv venv & source .venv/bin/activate)

uv pip install minigram-py aiohttp

and in python shell just run this

>>> from minigram import MiniGramUpdate
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/user/Projects/check-minigram-import-error/.venv/lib/python3.12/site-packages/minigram/__init__.py", line 3, in <module>
    from .main import MiniGram, MiniGramUpdate, AsyncMiniGram
  File "/Users/user/Projects/check-minigram-import-error/.venv/lib/python3.12/site-packages/minigram/main.py", line 9, in <module>
    from .request import sync_req, async_req
ImportError: cannot import name 'sync_req' from 'minigram.request' (/Users/user/Projects/check-minigram-import-error/.venv/lib/python3.12/site-packages/minigram/request.py). Did you mean: 'async_req'?