build(deps): bump underscore from 1.13.3 to 1.13.6 in /src

Bumps [underscore](https://github.com/jashkenas/underscore) from 1.13.3 to 1.13.6.
- [Commits](jashkenas/underscore@1.13.3...1.13.6)

---
updated-dependencies:
- dependency-name: underscore
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

src/package-lock.json

@@ -68,7 +68,7 @@
     "threads": "^1.7.0",
     "tinycon": "0.6.8",
     "ueberdb2": "^4.0.1",
-    "underscore": "1.13.3",
+    "underscore": "1.13.6",
     "unorm": "1.6.0",
     "wtfnode": "^0.9.1"
   },