Bump underscore from 1.8.3 to 1.13.1

Bumps [underscore](https://github.com/jashkenas/underscore) from 1.8.3 to 1.13.1.
- [Release notes](https://github.com/jashkenas/underscore/releases)
- [Commits](jashkenas/underscore@1.8.3...1.13.1)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]