Bump underscore from 1.11.0 to 1.12.0

Bumps [underscore](https://github.com/jashkenas/underscore) from 1.11.0 to 1.12.0.
- [Release notes](https://github.com/jashkenas/underscore/releases)
- [Commits](https://github.com/jashkenas/underscore/compare/1.11.0...1.12.0)

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

package.json

@@ -16,7 +16,7 @@
     "opensans-webkit": "^1.1.0",
     "popper.js": "^1.16.1",
     "sortablejs": "^1.12.0",
-    "underscore": "^1.10.2",
+    "underscore": "^1.12.0",
     "vis": "^4.21.0",
     "webpack-merge": "^5.4.0"
   },