Fix handling of check manifest

[blink1073]

Fixes #335 and a bug in the last release.

[codecov-commenter]

Codecov Report

Base: 82.51% // Head: 82.40% // Decreases project coverage by -0.10% ⚠️

Coverage data is based on head (18a0f43) compared to base (db21e02).
Patch coverage: 33.33% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #392      +/-   ##
==========================================
- Coverage   82.51%   82.40%   -0.11%     
==========================================
  Files          21       21              
  Lines        2899     2905       +6     
  Branches      380      382       +2     
==========================================
+ Hits         2392     2394       +2     
- Misses        373      376       +3     
- Partials      134      135       +1     

Impacted Files	Coverage Δ
jupyter_releaser/cli.py	88.74% <33.33%> (-1.13%)	⬇️

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