[Security] Bump ssri from 6.0.1 to 6.0.2

Bumps [ssri](https://github.com/npm/ssri) from 6.0.1 to 6.0.2. **This update includes a security fix.**
- [Release notes](https://github.com/npm/ssri/releases)
- [Changelog](https://github.com/npm/ssri/blob/v6.0.2/CHANGELOG.md)
- [Commits](https://github.com/npm/ssri/compare/v6.0.1...v6.0.2

)

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