chore(deps): update actions/upload-artifact digest to b4b15b8

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/upload-artifact	action	digest	604373d -> b4b15b8

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78%. Comparing base (ff8686e) to head (a835e2b).

Additional details and impacted files

@@          Coverage Diff          @@
##           master   #817   +/-   ##
=====================================
  Coverage      78%    78%           
=====================================
  Files          30     30           
  Lines        3365   3365           
=====================================
  Hits         2634   2634           
  Misses        731    731           

Flag	Coverage Δ
examples	59% <ø> (ø)
tests	75% <ø> (ø)

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