Language updates

[mwcraig]

This mostly updates some format calls to f-strings instead.

[codecov-commenter]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (eb10267) 53.69% compared to head (531a2cd) 53.66%.
Report is 10 commits behind head on main.

❗ Current head 531a2cd differs from pull request most recent head 773383b. Consider uploading reports for the commit 773383b to get more accurate results

Files	Patch %	Lines
stellarphot/plotting/multi_night_plots.py	0.00%	2 Missing ⚠️
stellarphot/utils/magnitude_transforms.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #227      +/-   ##
==========================================
- Coverage   53.69%   53.66%   -0.04%     
==========================================
  Files          23       23              
  Lines        2892     2890       -2     
==========================================
- Hits         1553     1551       -2     
  Misses       1339     1339              

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