Fix numpy bool_ deprecation warning

[AndrewAnnex]

• fixes an odd deprecation warning from numpy in the tests, expliciting casting to bool seems to do the trick.

as a bonus, a 1000 warnings should not show up anymore in the test results

[codecov[bot]]

Codecov Report

Merging #409 (303fea5) into main (859034f) will increase coverage by 0.00%. The diff coverage is 100.00%.

:exclamation: Current head 303fea5 differs from pull request most recent head 2f0be8f. Consider uploading reports for the commit 2f0be8f to get more accurate results

@@           Coverage Diff           @@
##             main     #409   +/-   ##
=======================================
  Coverage   99.88%   99.88%           
=======================================
  Files          12       12           
  Lines       15174    15176    +2     
=======================================
+ Hits        15156    15158    +2     
  Misses         18       18           

Impacted Files	Coverage Δ
spiceypy/spiceypy.py	99.69% <100.00%> (ø)
spiceypy/tests/test_wrapper.py	100.00% <100.00%> (ø)
spiceypy/utils/callbacks.py	100.00% <100.00%> (ø)

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