[flake8-async] ASYNC100 false positive in async generator expressions

[autinerd]

Hi!

ASYNC100 doesn't trigger with this code:

import asyncio

async def long_running_range():
    for i in range(10):
        await asyncio.sleep(2)
        yield i

async def main():
    async with asyncio.timeout(7):
        async for i in long_running_range():
            print(i)

asyncio.run(main())

but it does with this code:

import asyncio

async def long_running_range():
    for i in range(10):
        await asyncio.sleep(2)
        yield i

async def main():
    async with asyncio.timeout(7):
        print({i async for i in long_running_range()})

asyncio.run(main())

Thanks!