npmauto: bump sinon from 9.1.0 to 9.2.1 in /chromium

Bumps [sinon](https://github.com/sinonjs/sinon) from 9.1.0 to 9.2.1.
- [Release notes](https://github.com/sinonjs/sinon/releases)
- [Changelog](https://github.com/sinonjs/sinon/blob/master/CHANGELOG.md)
- [Commits](https://github.com/sinonjs/sinon/commits)

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

Author: dependabot[bot]