Update dependency sinon to v21.0.3

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
sinon (source)	21.0.2 → 21.0.3

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Release Notes

sinonjs/sinon (sinon)

v21.0.3

Compare Source

• 0494251b
  fix(#​2678): upgrade samsam to fix buffer comparisons (Carl-Erik Kopseng)

Released by Carl-Erik Kopseng on 2026-03-16.

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.96%. Comparing base (3bd50d9) to head (52a8ffb).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #828   +/-   ##
=======================================
  Coverage   99.96%   99.96%           
=======================================
  Files          33       33           
  Lines        3070     3070           
  Branches      476      476           
=======================================
  Hits         3069     3069           
  Misses          1        1           

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