Update module golang.org/x/net to v0.21.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
golang.org/x/net	v0.19.0 -> v0.21.0

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Configuration

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (748dc7e) 92.62% compared to head (aae439f) 92.62%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #246   +/-   ##
=======================================
  Coverage   92.62%   92.62%           
=======================================
  Files          34       34           
  Lines        1939     1939           
=======================================
  Hits         1796     1796           
  Misses        123      123           
  Partials       20       20           

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