Failing tests for python 3.9

[jduerholt]

Tests for python 3.9 are currently failing, reason is a fresh jax_typing release. They are already working on this: patrick-kidger/jaxtyping#271

I hope that there will be a new release by tomorrow, then we would be just fine and there is no need for any changes from our side.

cc: @bertiqwerty

[R-M-Lee]

It looks to me like this is still a problem. I think these tests are failing for the same reason:
https://github.com/experimental-design/bofire/actions/runs/11936229378/job/33271365605

[jduerholt]

I will further investigate it.

[R-M-Lee]

fyi: the tests I linked to were failing for a different reason

[baluyotraf]

Hello. I saw this from the jaxtyping PR. It looks like you are using | for typing.Union which is not supported in Python 3.9.

Either you use the typing.Union or do from __future__ import annotations.