Bump uvloop to v0.18.0

[Ale-Cas]

Summary

This PR bumps uvloop to v0.18.0 to try and address the mypy error in feat/support-3.12.
Related:
#2129 (comment)

Checklist

• I understand that this PR may be closed in case there was no previous discussion. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.

[Kludex]

That PR is already using the latest uvloop, that's exactly why it's failing.

[Ale-Cas]

You're right I thought it was using 0.17 but I double-checked the run and it's already 0.18, I'm trying to understand what would make mypy see EventLoopPolicy since it's in the uvloop init but I guess that's not related to uvicorn so I'll close this, sorry for the spam 🙏🏻

[Kludex]

np. Thanks for closing it. 👍

[graingert]

@Ale-Cas they added an __init__.pyi with most of the members removed this hides EventLoopPolicy from mypy. The issue is fixed upstream pending a release this weekend: MagicStack/uvloop#575 (comment)

[Ale-Cas]

Great! thank you both!
I was thinking something like this workaround / temp solution would make mypy happy:

def uvloop_setup(use_subprocess: bool = False) -> None:
    if hasattr(uvloop, "EventLoopPolicy"):
        asyncio.set_event_loop_policy(uvloop.EventLoopPolicy())

and maybe not related but what's the reason for the unused use_subprocess variable there? is it just for compatibility with the loop_setup from asyncio?