Update dependency sinon to ^8.1.1

Created by: renovate[bot]

This PR contains the following updates:

Package	Type	Update	New value	References	Sourcegraph
sinon (source)	devDependencies	patch	^8.1.1	homepage, source

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Release Notes

sinonjs/sinon

v8.1.1

Compare Source

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• Fundraiser for better docs: https://www.gofundme.com/f/sinon-docs

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