Add since_last_stable support in generate changelog

[blink1073]

Partially address #480

[codecov]

Codecov Report

Base: 82.29% // Head: 81.35% // Decreases project coverage by -0.93% ⚠️

Coverage data is based on head (9b89fba) compared to base (883e072).
Patch coverage: 12.50% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #482      +/-   ##
==========================================
- Coverage   82.29%   81.35%   -0.94%     
==========================================
  Files          20       20              
  Lines        2812     2816       +4     
  Branches      516      516              
==========================================
- Hits         2314     2291      -23     
- Misses        366      395      +29     
+ Partials      132      130       -2     

Impacted Files	Coverage Δ
jupyter_releaser/actions/generate_changelog.py	0.00% <0.00%> (ø)
jupyter_releaser/util.py	70.49% <40.00%> (-4.51%)	⬇️
jupyter_releaser/tests/conftest.py	97.48% <0.00%> (-1.26%)	⬇️
jupyter_releaser/npm.py	79.13% <0.00%> (-0.72%)	⬇️
jupyter_releaser/lib.py	81.25% <0.00%> (+0.62%)	⬆️

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