chore(deps): update dependency sinon to v6

[renovate]

This Pull Request updates devDependency sinon (homepage, source) from ^5.0.0 to ^6.0.0

Note: This PR was created on a configured schedule ("on the 1st through 7th day of the month" in timezone America/Los_Angeles) and will not receive updates outside those times.

Release Notes

v6.2.0

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• Add mock.usingPromise to set the Promise library for mock expectations

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v6.1.6

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• Upgrade Lolex, Nise and other dependencies

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v6.1.5

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• Fix #​1796, failing to stub Array.prototype.sort

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v6.1.4

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• Update lolex and nise dependencies to latest versions

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v6.1.3

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• Fix issue with matchers and cyclic references (#​1709)

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v6.1.2

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• Made callsArg, returnsArg, and throwsArg more strict (#​1848)

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v6.1.1

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• Restore useFakeXMLHttpRequest correctly in default sandbox (#​1840)

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v6.1.0

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• Syntax sugar for resolvesArg (#​1846)

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v6.0.1

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• Add fake behaviors to sandbox (#​1815)

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v6.0.0

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• Export Sinon and its functions as an EcmaScript module (#​1809 and #​1835)
• Document/test call ordering checks

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This PR has been generated by Renovate Bot.