Update actions/checkout digest to b4ffde6

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/checkout	action	digest	8ade135 -> b4ffde6

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[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (6a07a02) 66.05% compared to head (6b26375) 66.05%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #262   +/-   ##
=======================================
  Coverage   66.05%   66.05%           
=======================================
  Files           4        4           
  Lines         436      436           
=======================================
  Hits          288      288           
  Misses        140      140           
  Partials        8        8           

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