[core] unpin libffi=3.3 once conda resolves the dependency issue

[scv119]

What happened + What you expected to happen

as title, we should unpin it once the root cause is resolved. https://github.com/ray-project/ray/pull/33294

blocked by https://github.com/conda/conda/issues/12287#issuecomment-1443016695

Versions / Dependencies

latest

Reproduction script

latest

Issue Severity

Medium: It is a significant difficulty but I can work around it.

[scv119]

nothing we can do here. the root cause seems not fixed yet.

[can-anyscale]

@rickyyx this issue will probably block docker build for python 3.11 (https://github.com/ray-project/ray/blob/master/docker/base-deps/Dockerfile#L60), libffi=3.3 is not compatible with python 3.11

[rickyyx]

Ah, this is sad...

Maybe could we figure out why we need libffi in the first place?

[jjyao]

Fixed by #41339