JP-3589: fixed deprecated code from numpy 2.0 release

[emolter]

Resolves JP-3589

Closes #8400

This PR addresses a few loose-end code deprecations from the new AMI suite and from the numpy 2.0 update.

Checklist for maintainers

• added entry in CHANGES.rst within the relevant release section
• updated or added relevant tests
• updated relevant documentation
• added relevant milestone
• added relevant label(s)
• ran regression tests, post a link to the Jenkins job below.
  How to run regression tests on a PR
• Make sure the JIRA ticket is resolved properly

[emolter]

Regtest run started here

edit: all tests passed

[codecov]

Codecov Report

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

Project coverage is 75.78%. Comparing base (2fb073e) to head (ba2f60e).
Report is 24 commits behind head on master.

Files	Patch %	Lines
jwst/ami/leastsqnrm.py	0.00%	3 Missing ⚠️
jwst/extract_1d/soss_extract/atoca.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8415      +/-   ##
==========================================
+ Coverage   75.31%   75.78%   +0.47%     
==========================================
  Files         474      476       +2     
  Lines       38965    39450     +485     
==========================================
+ Hits        29345    29897     +552     
+ Misses       9620     9553      -67     

Flag	Coverage Δ		*Carryforward flag
nightly	77.66% <ø> (+0.32%)	⬆️	Carriedforward from 2fb073e

*This pull request uses carry forward flags. Click here to find out more.

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[hbushouse]

LGTM. All tests are passing.