Bump sinon from 8.1.1 to 9.0.0 (#2494)

Bumps [sinon](https://github.com/sinonjs/sinon) from 8.1.1 to 9.0.0.
- [Release notes](https://github.com/sinonjs/sinon/releases)
- [Changelog](https://github.com/sinonjs/sinon/blob/master/CHANGELOG.md)
- [Commits](sinonjs/sinon@v8.1.1...v9.0.0)

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

Author: dependabot-preview[bot]

package-lock.json

@@ -63,7 +63,7 @@
     "mocha-multi-reporters": "~1.1.7",
     "mock-fs": "~4.10.4",
     "rewire": "~4.0.1",
-    "sinon": "~8.1.1",
+    "sinon": "~9.0.0",
     "tslint": "~6.0.0",
     "typescript": "~3.5.3",
     "vsce": "~1.64.0",