Bump underscore from 1.8.3 to 1.12.1 in /scripts/jenkins

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>

scripts/jenkins/package.json

@@ -27,7 +27,7 @@
     "dependencies": {
         "minimist": "~1.1.1",
         "sync-request": "2.0.1",
-        "underscore": "1.8.3"
+        "underscore": "1.12.1"
     },
     "devDependencies": {
         "gulp": "^3.8.11"