Pin numpy<2.0.0 to avoid pulling 2.0.0rcX

[valeriupredoi]

Description

We should pin numpy <2 for the release - David Hassell pulled the rc1 in the cfpython env, here's what I wrote to him this is the bug in pip that makes possible a pre package get pulled in https://github.com/pypa/pip/issues/7579 and real world case for the same issue you had here https://github.com/Unidata/cftime/issues/327 - slim chances for us to hit this bug, since all's been fine so far, but better err on the safe side!

@ehogan @chrisbillowsMO I think it'd be safe to include this in the release, maybe just after ESMValCore rc1, so it doesn't mess with your current procedures. Once numpy=2 stable is out, and we've fixed all the wiggles (ours or not) via https://github.com/ESMValGroup/ESMValCore/pull/2395 then we can unpin. Cheers :beer:

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 94.51%. Comparing base (a782af8) to head (fc269ae).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2415 +/- ## ======================================= Coverage 94.51% 94.51% ======================================= Files 246 246 Lines 14020 14020 ======================================= Hits 13251 13251 Misses 769 769 ```

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[valeriupredoi]

cheers @bouweandela :beer: