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

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
golang.org/x/sync	v0.11.0 → v0.21.0

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Configuration

📅 Schedule: (UTC)

• Branch creation
  • "on the first day of the month"
• Automerge
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🚦 Automerge: Enabled.

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[renovate]

ℹ️ Artifact update notice

File name: go.mod

In order to perform the update(s) described in the table above, Renovate ran the go get command, which resulted in the following additional change(s):

• The go directive was updated for compatibility reasons

Details:

Package	Change
go	1.24.0 -> 1.25.0

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 45.52%. Comparing base (6bdcbdc) to head (57a2011).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #148   +/-   ##
=======================================
  Coverage   45.52%   45.52%           
=======================================
  Files          18       18           
  Lines        1777     1777           
=======================================
  Hits          809      809           
  Misses        901      901           
  Partials       67       67           

Flag	Coverage Δ
go	45.52% <ø> (ø)

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