Add upper pin to numpy in preparation for v2

[ml-evs]

In preparation for https://numpy.org/devdocs/numpy_2_0_migration_guide.html.

We barely use numpy ourselves but some of our optional deps definitely do, so this will probably end up blocking until the whole cascade of deps updates has finished. Also should be backported to the v0.25.x branch and releases.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (f17897f) 90.77% compared to head (aead9d7) 90.77%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1928   +/-   ##
=======================================
  Coverage   90.77%   90.77%           
=======================================
  Files          75       75           
  Lines        4728     4728           
=======================================
  Hits         4292     4292           
  Misses        436      436           

Flag	Coverage Δ
project	90.77% <ø> (ø)
validator	90.69% <ø> (ø)

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