Fix: use a "flat" style for the GitHub stars badge

[emmercm]

No description provided.

[github-actions]

🧪 Branch testing instructions

This pull request can be tested locally with the following command:

npm exec --yes -- "github:emmercm/igir#emmercm/gh-stars-badge-flat" [commands..] [options]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (77b4d7d) 93.37% compared to head (084578a) 93.46%.

❗ Current head 084578a differs from pull request most recent head bcada6c. Consider uploading reports for the commit bcada6c to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #910      +/-   ##
==========================================
+ Coverage   93.37%   93.46%   +0.08%     
==========================================
  Files          86       86              
  Lines        5374     5355      -19     
  Branches     1230     1229       -1     
==========================================
- Hits         5018     5005      -13     
+ Misses        338      332       -6     
  Partials       18       18              

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[github-actions]

🔒 Inactive pull request lock

This pull request has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.

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