Bump underscore from 1.9.1 to 1.12.1

Bumps [underscore](https://github.com/jashkenas/underscore) from 1.9.1 to 1.12.1.
- [Release notes](https://github.com/jashkenas/underscore/releases)
- [Commits](jashkenas/underscore@1.9.1...1.12.1)

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Author: dependabot[bot]