Pin publish test to 3.12

[konstin]

The bump to 3.13 broke the test

[ranjithrajv]

How about introducing a command or flag to uv publish that allows setting a custom timeout value?
This would offer greater flexibility by letting users specify the timeout according to their specific requirements instead of relying on a default fixed value.

[konstin]

This is applicable to the test script only

[zanieb]

Oof 20 minutes is really long for the test to run. Why is it taking so long?

[zanieb]

And it still failed here — I think there needs to be a different solution.