Bumps [mustache](https://github.com/janl/mustache.js) from 4.1.0 to 4.2.0.
- [Release notes](https://github.com/janl/mustache.js/releases)
- [Changelog](https://github.com/janl/mustache.js/blob/master/CHANGELOG.md)
- [Commits](https://github.com/janl/mustache.js/compare/v4.1.0...v4.2.0)
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