docs: update badge for CI workflow

[browniebroke]

Committed via https://github.com/asottile/all-repos

[codecov]

Codecov Report

Merging #357 (b7c642f) into main (ee0438b) will not change coverage.
The diff coverage is n/a.

❗ Current head b7c642f differs from pull request most recent head 7b0738a. Consider uploading reports for the commit 7b0738a to get more accurate results

@@           Coverage Diff           @@
##             main     #357   +/-   ##
=======================================
  Coverage   84.27%   84.27%           
=======================================
  Files           7        7           
  Lines         159      159           
  Branches       20       20           
=======================================
  Hits          134      134           
  Misses         12       12           
  Partials       13       13           

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