Bump sinon from 8.1.0 to 8.1.1

Bumps [sinon](https://github.com/sinonjs/sinon) from 8.1.0 to 8.1.1.
- [Release notes](https://github.com/sinonjs/sinon/releases)
- [Changelog](https://github.com/sinonjs/sinon/blob/master/CHANGELOG.md)
- [Commits](sinonjs/sinon@v8.1.0...v8.1.1)

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

Author: dependabot-preview[bot]

package-lock.json

@@ -40,6 +40,6 @@
     "mocha": "7.0.0",
     "nyc": "15.0.0",
     "referee": "^1.2.0",
-    "sinon": "8.1.0"
+    "sinon": "8.1.1"
   }
 }