Stop erroring on ensure_sha for now

[blink1073]

We are looking at the wrong remote branches, this will need fixing.

[codecov-commenter]

Codecov Report

Base: 81.59% // Head: 81.59% // No change to project coverage 👍

Coverage data is based on head (682b1a7) compared to base (b272bca).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #426   +/-   ##
=======================================
  Coverage   81.59%   81.59%           
=======================================
  Files          20       20           
  Lines        2776     2776           
  Branches      358      358           
=======================================
  Hits         2265     2265           
  Misses        385      385           
  Partials      126      126           

Impacted Files	Coverage Δ
jupyter_releaser/util.py	71.89% <0.00%> (ø)

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