docs: update badge link

[codeboten]

Noticed the badge was showing a failing status even though the CI appeared to be passing:

I used the "create status badge" functionality to create the badge:

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.2%. Comparing base (206f5f8) to head (56c17c5).
Report is 1 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #6144   +/-   ##
=====================================
  Coverage   82.2%   82.2%           
=====================================
  Files        273     273           
  Lines      23674   23674           
=====================================
+ Hits       19475   19476    +1     
+ Misses      3852    3851    -1     
  Partials     347     347           

see 1 file with indirect coverage changes

[dmathieu]

Merging this without the 24h wait time, as this is a trivial change.