chore(deps-dev): bump sinon from 7.5.0 to 8.1.1

[dependabot-preview]

Bumps sinon from 7.5.0 to 8.1.1.

Changelog

Sourced from sinon's changelog.

8.1.1 / 2020-01-22

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

8.1.0 / 2020-01-16

• Support negative indices in getCall (#2199)

8.0.4 / 2020-01-06

• Remove misleading 'own' from exception message

8.0.3 / 2020-01-06

• Move .printf to proxy

8.0.2 / 2019-12-30

• Upgrade @sinonjs/samsam to latest
• Upgrade nise to 3.0.1

8.0.1 / 2019-12-23

• Force upgrade @sinonjs/commons (#2181)
• Update docs/changelog.md and set new release id in docs/_config.yml
• Add release documentation for v8.0.0

8.0.0 / 2019-12-22

The major release is caused by removing old mistakes and upgrading dependencies that themselves have had new major releases.

• Upgrade nise, @sinonjs/formatio, @sinonjs/samsam and @sinonjs/referee
• Update lolex and nise to get new async timer methods (see https://github.com/sinonjs/lolex/blob/master/CHANGELOG.md)
• Remove sinon.spyCall
• Remove sinon.sandbox.create
• Remove obsolete deprecated.printWarning stubbing from test

Commits

• f8695b0 8.1.1
• 61605c1 Update CHANGELOG.md and AUTHORS for new release
• 942878a Add links for better docs campaign
• 9f59015 Merge pull request #2200 from sinonjs/ci-action-performance
• 78c96e5 Set SINON_CHROME_BIN for esm-bundle test
• d86321e Skip Chromium download in GitHub action
• 181a030 Add module caching to GitHub action
• 384732e Update docs/changelog.md and set new release id in docs/_config.yml
• dbfe691 Add release documentation for v8.1.0
• cb8f3b7 8.1.0
• Additional commits viewable in compare view

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[coveralls]

Coverage remained the same at 94.118% when pulling 06658f9 on dependabot/npm_and_yarn/sinon-8.1.1 into 0c02810 on master.

[dependabot-preview]

Superseded by #118.