chore(deps): update dependency sinon to v8

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
sinon (source)	devDependencies	major	7.5.0 -> 8.1.1

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Release Notes

sinonjs/sinon

### [`v8.1.1`](https://togithub.com/sinonjs/sinon/blob/master/CHANGELOG.md#​811--2020-01-22) [Compare Source](https://togithub.com/sinonjs/sinon/compare/v8.1.0...v8.1.1) ================== - Fundraiser for better docs: ### [`v8.1.0`](https://togithub.com/sinonjs/sinon/blob/master/CHANGELOG.md#​810--2020-01-16) [Compare Source](https://togithub.com/sinonjs/sinon/compare/v8.0.4...v8.1.0) ================== - Support negative indices in getCall ([#​2199](https://togithub.com/sinonjs/sinon/issues/2199)) ### [`v8.0.4`](https://togithub.com/sinonjs/sinon/blob/master/CHANGELOG.md#​804--2020-01-06) [Compare Source](https://togithub.com/sinonjs/sinon/compare/v8.0.3...v8.0.4) ================== - Remove misleading 'own' from exception message ### [`v8.0.3`](https://togithub.com/sinonjs/sinon/blob/master/CHANGELOG.md#​803--2020-01-06) [Compare Source](https://togithub.com/sinonjs/sinon/compare/v8.0.2...v8.0.3) ================== - Move .printf to proxy ### [`v8.0.2`](https://togithub.com/sinonjs/sinon/blob/master/CHANGELOG.md#​802--2019-12-30) [Compare Source](https://togithub.com/sinonjs/sinon/compare/v8.0.1...v8.0.2) ================== - Upgrade [@​sinonjs/samsam](https://togithub.com/sinonjs/samsam) to latest - Upgrade nise to 3.0.1 ### [`v8.0.1`](https://togithub.com/sinonjs/sinon/blob/master/CHANGELOG.md#​801--2019-12-23) [Compare Source](https://togithub.com/sinonjs/sinon/compare/v8.0.0...v8.0.1) ================== - Force upgrade [@​sinonjs/commons](https://togithub.com/sinonjs/commons) ([#​2181](https://togithub.com/sinonjs/sinon/issues/2181)) - Update `docs/changelog.md` and set new release id in `docs/_config.yml` - Add release documentation for v8.0.0 ### [`v8.0.0`](https://togithub.com/sinonjs/sinon/blob/master/CHANGELOG.md#​800--2019-12-22) [Compare Source](https://togithub.com/sinonjs/sinon/compare/v7.5.0...v8.0.0) ================== The major release is caused by removing old mistakes and upgrading dependencies that themselves have had new major releases. - Upgrade nise, [@​sinonjs/formatio](https://togithub.com/sinonjs/formatio), [@​sinonjs/samsam](https://togithub.com/sinonjs/samsam) and [@​sinonjs/referee](https://togithub.com/sinonjs/referee) - Update lolex and nise to get new async timer methods (see ) - Remove `sinon.spyCall` - Remove `sinon.sandbox.create` - Remove obsolete `deprecated.printWarning` stubbing from test

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