Workbox: upgrade Underscore.js to 1.13.1 or higher

Issue Summary

Workbox host plugin in Confluence is currently using underscore.js 1.3.1. This is old enough to not be vulnerable to CVE-2021-23358, but it should be using the version provided by Confluence, not its own

The package underscore from 1.13.0-0 and before 1.13.0-2
From 1.3.2 and before 1.12.1 are vulnerable to Arbitrary Code Injection via the template function, particularly when a variable property is passed as an argument as it is not sanitized.

Steps to Reproduce

1. Install Confluence 7.13.1 or below

Expected Results

Have Confluence using underscore.js 1.13.1 or higher.

Actual Results

Workbox host plugin in Confluence is using underscore.js 1.3.1.

Workaround

Currently there is no known workaround for this behavior. A workaround will be added here when available