CI: Dateutil broke CI

[lithomas1]

Failing CI is actions 3.9 numpy dev.

It fails with a FileNotFound error I think and I believe that its probably an upstream issue.

Any reason why we're installing dateutil from source here on the CI? I know that its a dependency but we aren't installing pytz from source on the same env.

[jorisvandenbossche]

Do you have a traceback or link to one of the failing builds?

[mroeschke]

Don't think we're seeing this anymore, especially since we're on numpy dev 3.10 and not reading from source, so closing. Can reopen again if this is an issue.