CI: New python-dev build causes errors in test-cases

[eicchen]

Pandas version checks

• I have checked that this issue has not already been reported.

• I have confirmed this bug exists on the latest version of pandas.

• I have confirmed this bug exists on the main branch of pandas.

Reproducible Example

https://github.com/pandas-dev/pandas/actions/runs/18354036003/job/52281282834
https://github.com/pandas-dev/pandas/actions/runs/18354390134/job/52282486675
https://github.com/pandas-dev/pandas/actions/runs/18352285478

Issue Description

The same errors are cropping up in CI runs from today across multiple PRs.

This is likely from a new python-dev build (3.14.0) and pydantic build (2.12) published yesterday.
For example on my PR, I have only changed the .rst and a test case since the previous commit, the errors have nothing to do with the test case I changed

I've also tried it on main and the errors existed there too

Expected Behavior

Change tests to accomodate updates

Installed Versions

NA

[jorisvandenbossche]

The pydantic errors with iceberg are related to an regression in the latest pydantic release (apache/iceberg-python#2590)

[jorisvandenbossche]

And the failures on python-dev and numpy-dev seems to be caused by an upstream numpy regression: numpy/numpy#29907

[jorisvandenbossche]

And numpy will be fixed when there are fresh nightlies: numpy/numpy#29897

[eicchen]

Thanks for looking into it Joris!