Bump stringz from 2.0.0 to 2.1.0 (#13331)

Bumps [stringz](https://github.com/sallar/stringz) from 2.0.0 to 2.1.0.
- [Release notes](https://github.com/sallar/stringz/releases)
- [Changelog](https://github.com/sallar/stringz/blob/master/CHANGELOG.md)
- [Commits](https://github.com/sallar/stringz/commits

)

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