build(deps): bump underscore from 1.8.3 to 1.12.1

Bumps [underscore](https://github.com/jashkenas/underscore) from 1.8.3 to 1.12.1.
- [Commits](jashkenas/underscore@1.8.3...1.12.1)

---
updated-dependencies:
- dependency-name: underscore
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -29,7 +29,7 @@
     "requirejs-text": "2.0.16",
     "sass": "^1.58.3",
     "sinon": "1.17.7",
-    "underscore": "~1.8.3",
+    "underscore": "~1.12.1",
     "urijs": "1.19.11"
   },
   "devDependencies": {