Update dependency sinon to v21

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This notice will be removed on 2025-10-07.

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This PR contains the following updates:

Package	Change	Age	Confidence
sinon (source)	^19.0.4 -> ^21.0.0

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Release Notes

sinonjs/sinon (sinon)

v21.0.0

Compare Source

• fd10f13f
  chore!: remove assert.failException property (#​2659) (Morgan Roderick)

  This was used for allowing customisation of the thrown error between
  sandboxes and for customisation for integrations (most likely from the
  days of BusterJS).

  To my knowledge and what I've been able to find on GitHub, this has
  never had any production use by end users.

  BREAKING CHANGE: this removes assert.failException from the API

Released by Morgan Roderick on 2025-06-13.

v20.0.0

Compare Source

• b6daed26
  chore!: remove usingPromise (Morgan Roderick)

  Everyone should be using native promises by now, or should know how to stub natives

• 95d4b8fc
  chore!: remove fakeXMLHttpRequest and fakeServer (Morgan Roderick)

  BREAKING CHANGE: remove fakeXMLHttpRequest and fakeServer from the API

Released by Morgan Roderick on 2025-03-24.

v19.0.5

Compare Source

• 67d19ff0
  chore: deprecate usingPromise (#​2651) (Morgan Roderick)
• 598dddb6
  chore: deprecate useFakeXMLHttpRequest and useFakeServer (Morgan Roderick)

Released by Morgan Roderick on 2025-03-23.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.64%. Comparing base (97b42ad) to head (1a0d034).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #452   +/-   ##
=======================================
  Coverage   92.64%   92.64%           
=======================================
  Files         112      112           
  Lines       18641    18641           
  Branches     1456     1455    -1     
=======================================
  Hits        17270    17270           
  Misses       1300     1300           
  Partials       71       71           

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