docs: Fix CI coverage badge URL

[matthewfeickert]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.17%. Comparing base (0b11de5) to head (104b305).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #244   +/-   ##
=======================================
  Coverage   91.17%   91.17%           
=======================================
  Files           2        2           
  Lines         306      306           
  Branches       83       83           
=======================================
  Hits          279      279           
  Misses         17       17           
  Partials       10       10           

Flag	Coverage Δ
unittests-3.10	90.84% <ø> (ø)
unittests-3.11	90.84% <ø> (ø)
unittests-3.12	90.84% <ø> (ø)
unittests-3.8	90.84% <ø> (ø)
unittests-3.9	90.84% <ø> (ø)

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