Update Lookup Table PSF

[gbrammer]

Enable fitting for shifts of each individual trace and then re-derive lookup table PSF files.

The files were generated with the notebooks at https://github.com/gbrammer/msaexp-calibration.

[codecov]

Codecov Report

Attention: Patch coverage is 37.17472% with 338 lines in your changes missing coverage. Please review.

Project coverage is 50.82%. Comparing base (ba717fa) to head (4614b80).
Report is 66 commits behind head on main.

Files with missing lines	Patch %	Lines
msaexp/utils.py	19.19%	240 Missing ⚠️
msaexp/spectrum.py	56.14%	50 Missing ⚠️
msaexp/slit_combine.py	61.90%	48 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #84       +/-   ##
===========================================
- Coverage   65.75%   50.82%   -14.94%     
===========================================
  Files          16       16               
  Lines        7437     7908      +471     
===========================================
- Hits         4890     4019      -871     
- Misses       2547     3889     +1342     

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