[issue35109] Doctest in CI uses python binary built from master causing DeprecationWarnings

[Julien Palard]

Julien Palard <julien+python at palard.fr> added the comment:

> I propose using stable version of Python like python 3.7

If we do so, we won't be able to write doctest about new features (existing in 3.8, not existing in 3.7), which is worse than having warnings.

I think the right move is to do some PR on remote projects (like babel) to fix the warning, future-proofing them from having a real issue in 3.8.

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<https://bugs.python.org/issue35109>
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