hotfix(numpy 2.0 deprecation)

[mnfienen]

simple fix for soon-to-be deprecated np.alltrue. See Issue #2086 - this sorts it out

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (86eb092) 73.0% compared to head (354255a) 73.0%.
Report is 2 commits behind head on develop.

❗ Current head 354255a differs from pull request most recent head 9f0d512. Consider uploading reports for the commit 9f0d512 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           develop   #2088   +/-   ##
=======================================
  Coverage     73.0%   73.0%           
=======================================
  Files          259     259           
  Lines        59357   59357           
=======================================
  Hits         43352   43352           
  Misses       16005   16005           

Files	Coverage Δ
flopy/plot/map.py	83.5% <0.0%> (ø)