[CI] Update setup-python action to v5 for GHA (#95414)

We currently receive a warning on all Github Actions workflows that use
`setup-python`, since they all use v4 of the action, which uses the
deprecated Node.js 16. This PR upgrades the action in all places to v5,
which uses Node.js 20 (see [setup-python release
page](https://github.com/actions/setup-python/releases/tag/v5.0.0))