chore(deps-dev): bump sinon from 7.5.0 to 8.1.0

Bumps [sinon](https://github.com/sinonjs/sinon) from 7.5.0 to 8.1.0.
- [Release notes](https://github.com/sinonjs/sinon/releases)
- [Changelog](https://github.com/sinonjs/sinon/blob/master/CHANGELOG.md)
- [Commits](sinonjs/sinon@v7.5.0...v8.1.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Author: dependabot-preview[bot]

package.json

@@ -18,6 +18,6 @@
     "browserify": "^16.0.0",
     "expect.js": "~0.3.1",
     "mocha": "~6.2.0",
-    "sinon": "7.5.0"
+    "sinon": "8.1.0"
   }
 }