Replace deprecated np.in1d with np.isin

[Copilot]

numpy.in1d was deprecated in NumPy 1.24 and removed in recent versions, causing test failures. Replace all usages with the equivalent numpy.isin.

Changes

• 9 files updated across py/picca/, py/picca/bin/, py/picca/pk1d/, py/picca/delta_extraction/, and tutorials/

# Before
w = np.in1d(catalogue["THING_ID"], drq_catalogue["THING_ID"])

# After
w = np.isin(catalogue["THING_ID"], drq_catalogue["THING_ID"])

np.isin is a drop-in replacement — identical signature and return behavior for all use cases here.

Original prompt

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This section details on the original issue you should resolve

<issue_title>numpy.in1d is deprecated and needs to be removed</issue_title>
<issue_description>We need to refactor the code to use np.isin instead of np.in1d, as the latter is deprecated and has been removed in recent versions of numpy. A number of tests are failing due to this</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes numpy.in1d is deprecated and needs to be removed #1126

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[HiramHerrera]

These changes look inoffensive to me and correctly address the deprecation of np.in1d in NumPy > 1.24.

Everything looks good to me.