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

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
golang.org/x/mod	v0.20.0 -> v0.21.0

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 52.01%. Comparing base (e7f1026) to head (e807854).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #487   +/-   ##
=======================================
  Coverage   52.01%   52.01%           
=======================================
  Files          18       18           
  Lines        1367     1367           
=======================================
  Hits          711      711           
  Misses        544      544           
  Partials      112      112           

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[renovate]

⚠️ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

♻ Renovate will retry this branch, including artifacts, only when one of the following happens:

• any of the package files in this branch needs updating, or
• the branch becomes conflicted, or
• you click the rebase/retry checkbox if found above, or
• you rename this PR's title to start with "rebase!" to trigger it manually

The artifact failure details are included below:

File name: go.sum

Command failed: install-tool golang 1.22.7