Use a more efficient fetch

[blink1073]

Fixes #249

[codecov-commenter]

Codecov Report

Merging #257 (98d6ae4) into main (0082d05) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #257      +/-   ##
==========================================
+ Coverage   85.10%   85.13%   +0.03%     
==========================================
  Files          19       19              
  Lines        2349     2355       +6     
  Branches      303      304       +1     
==========================================
+ Hits         1999     2005       +6     
  Misses        252      252              
  Partials       98       98              

Impacted Files	Coverage Δ
jupyter_releaser/lib.py	84.03% <100.00%> (ø)
jupyter_releaser/tests/test_cli.py	99.04% <100.00%> (+<0.01%)	⬆️
jupyter_releaser/util.py	73.93% <100.00%> (+0.37%)	⬆️
jupyter_releaser/tests/test_functions.py	98.65% <0.00%> (+0.01%)	⬆️

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