Matrix testing fix

[w-k-jones]

Fixes a bug in transform_feature_points which was causing the failing matrix tests. I also fixed a couple of other depreciation warnings in the tests, and added python 3.12 to matrix testing. Resolves #444

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[github-actions]

Linting results by Pylint:

Your code has been rated at 8.72/10 (previous run: 8.72/10, +0.00)
_{The linting score is an indicator that reflects how well your code version follows Pylint’s coding standards and quality metrics with respect to the RC_v1.5.x branch.
A decrease usually indicates your new code does not fully meet style guidelines or has potential errors.}

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 60.96%. Comparing base (4fa1efa) to head (81a580b).
Report is 82 commits behind head on RC_v1.5.x.

Additional details and impacted files

@@              Coverage Diff              @@
##           RC_v1.5.x     #451      +/-   ##
=============================================
- Coverage      60.98%   60.96%   -0.03%     
=============================================
  Files             23       23              
  Lines           3550     3548       -2     
=============================================
- Hits            2165     2163       -2     
  Misses          1385     1385              

Flag	Coverage Δ
unittests	60.96% <100.00%> (-0.03%)	⬇️

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[w-k-jones]

@JuliaKukulies @freemansw1 This should fix the matrix testing issues, are you happy to review?

[JuliaKukulies]

Looks good! Thank you for fixing this so quickly!

[JuliaKukulies]

@w-k-jones, fyi I have merged in these changes in #450 and this fixes the matrix testing issue just as here

[freemansw1]

Thanks, @w-k-jones