Fix/numpy

[FariborzDaneshvar-NOAA]

I replaced round_ with round in surrogate.py and karhunen_loeve_expansion.py to address the following warning:

DeprecationWarning: `round_` is deprecated as of NumPy 1.25.0, and will be removed in NumPy 2.0. Please use `round` instead.

I tested it locally and it worked fine!

@SorooshMani-NOAA would you confirm making this merge?

[SorooshMani-NOAA]

@FariborzDaneshvar-NOAA here as well, please check the rebased changes and let me know if all looks good for merge, thanks!

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 20.68%. Comparing base (2d08625) to head (b0a21a6).

Files	Patch %	Lines
ensembleperturbation/plotting/surrogate.py	0.00%	2 Missing ⚠️
...rtainty_quantification/karhunen_loeve_expansion.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #150   +/-   ##
=======================================
  Coverage   20.68%   20.68%           
=======================================
  Files          28       28           
  Lines        3872     3872           
=======================================
  Hits          801      801           
  Misses       3071     3071           

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