Fixes following numpy 2

[dnerini]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 85.71429% with 1 line in your changes missing coverage. Please review.

Project coverage is 83.50%. Comparing base (2bc6b38) to head (87df7a6).

Files	Patch %	Lines
pysteps/io/importers.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #365   +/-   ##
=======================================
  Coverage   83.50%   83.50%           
=======================================
  Files         159      159           
  Lines       12562    12564    +2     
=======================================
+ Hits        10490    10492    +2     
  Misses       2072     2072           

Flag	Coverage Δ
unit_tests	83.50% <85.71%> (+<0.01%)	⬆️

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