fix(git-node-vote): specify GH API version

[aduh95]

Looks like GH made an update which results in getting either the file content, or a JSON string with the metadata. Setting the Accept and X-GitHub-Api-Version to ensure consistent results

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 64.50%. Comparing base (bdc212b) to head (319a2d5).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1222   +/-   ##
=======================================
  Coverage   64.50%   64.50%           
=======================================
  Files          65       65           
  Lines       12300    12300           
=======================================
  Hits         7934     7934           
  Misses       4366     4366           

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