fix: aiohttp interceptor compatibility with aiohttp 4.x

[ChaitanyaKhoje]

Problem

aiohttp.ClientHandlerType was removed in aiohttp 4.0, causing an AttributeError when pook's aiohttp interceptor is loaded with aiohttp 4.x installed.

Affected line: src/pook/interceptors/aiohttp.py — the __call__ signature uses aiohttp.ClientHandlerType as a type annotation.

Fix

Replace aiohttp.ClientHandlerType with Callable from typing, which is the correct approach for aiohttp 4.x and remains backwards compatible.

Reproduction

Pin aiohttp>=4 and run any test suite that imports pook's aiohttp interceptor — test collection will fail.

Workaround used downstream: pin aiohttp<4