Remove unused aiohttp ENABLE_CLEANUP_CLOSED code path

[cdce8p]

Proposed change

We only support Python 3.12+. ENABLE_CLEANUP_CLOSED is always evaluated to True.
Added originally with

• Disable cleanup_closed for aiohttp.TCPConnector with cpython 3.11.1+ #93013
• Re-enable cleanup_closed on cpython >= 3.11.4 #93120

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[bdraco]

We are likely about to make cleanup_closed a NOOP

aio-libs/aiohttp#9590

[cdce8p]

We are likely about to make cleanup_closed a NOOP

aio-libs/aiohttp#9590

👍🏻 Technically we still support 3.12.0 as well though. We can remove it completely once we drop 3.12 next year.

[bdraco]

I was thinking we could change the constant here to return False for 3.12.7+ and 3.13.1+ so we can get ahead of aio-libs/aiohttp#9590

[cdce8p]

You're the performance expert, but if it should be a noop in the future, would it even make a difference to set it to false explicitly? I'd expect the noop to not care if it's True or False.

[bdraco]

It won't make any difference once aiohttp makes the change but I'm not sure when we are going to do that in aiohttp so it would be nicer to do it here ahead of time.

[cdce8p]

Fine by me. Closing this one then.