chore(deps): update dart-lang/setup-dart digest to 21e68f4

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
dart-lang/setup-dart	action	digest	a57a6c0 → 21e68f4

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Configuration

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.02%. Comparing base (fccb8b7) to head (663836f).
Report is 2 commits behind head on master.

❗ Current head 663836f differs from pull request most recent head 991a1d3

Please upload reports for the commit 991a1d3 to get more accurate results.

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #48   +/-   ##
=======================================
  Coverage   97.02%   97.02%           
=======================================
  Files           6        6           
  Lines         202      202           
=======================================
  Hits          196      196           
  Misses          6        6           

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