fix(deps): update module golang.org/x/sync to v0.21.0

[botty-mcbottington]

This PR contains the following updates:

Package	Change	Age	Confidence
golang.org/x/sync	v0.19.0 → v0.20.0

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[botty-mcbottington]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 61.41%. Comparing base (69fb0d7) to head (cf9c2fc).
⚠️ Report is 12 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #373   +/-   ##
=======================================
  Coverage   61.41%   61.41%           
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  Files          56       56           
  Lines        3315     3315           
=======================================
  Hits         2036     2036           
  Misses        999      999           
  Partials      280      280           

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