Migrate from the deprecated and removed APIs

[tisonkun]

The old API is removed in Py 3.12 and in entrypoint.sh we always use the latest Py version.

[tisonkun]

cc @rht This can fail all the downstream workflows.

[i-ky]

cc @rht This can fail all the downstream workflows.

Not only can, but actually does fail downstream workflows. Please address the issue as soon as possible.

[rht]

LGTM @timabbott

[i-ky]

I filed #110 with a less risky change, which can be applied ASAP to fix failing workflows. Python 3.12 compatibility can be addressed with less stress after that.

[timabbott]

OK, do we still need this given #110 is integrated?

[i-ky]

OK, do we still need this given #110 is integrated?

I would say yes, because you cannot stay on 3.11 forever. Eventually (in October 2027 it will reach end-of-life and staying on 3.11 further will have security implications.

#110 affects this PR in two ways:

1. there is no more pressure to integrate the fix ASAP, you have plenty of time to decide if this is the best way to move away from the deprecated functionality (I am not competent enough to judge this aspect);
2. the pinned Python version in Dockerfile needs to be bumped to 3.12.

[timabbott]

Merged, thanks @i-ky and @tisonkun!

[i-ky]

2. the pinned Python version in Dockerfile needs to be bumped to 3.12.

Now this can be done.