Bump underscore from 1.10.2 to 1.13.1

Bumps [underscore](https://github.com/jashkenas/underscore) from 1.10.2 to 1.13.1.
- [Release notes](https://github.com/jashkenas/underscore/releases)
- [Commits](https://github.com/jashkenas/underscore/compare/1.10.2...1.13.1)

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

services/docstore/package-lock.json

@@ -7066,9 +7066,9 @@
       "dev": true
     },
     "underscore": {
-      "version": "1.10.2",
-      "resolved": "https://registry.npmjs.org/underscore/-/underscore-1.10.2.tgz",
-      "integrity": "sha512-N4P+Q/BuyuEKFJ43B9gYuOj4TQUHXX+j2FqguVOpjkssLUUrnJofCcBccJSCoeturDoZU6GorDTHSvUDlSQbTg=="
+      "version": "1.12.1",
+      "resolved": "https://registry.npmjs.org/underscore/-/underscore-1.12.1.tgz",
+      "integrity": "sha512-hEQt0+ZLDVUMhebKxL4x1BTtDY7bavVofhZ9KZ4aI26X9SRaE+Y3m83XUL1UP2jn8ynjndwCCpEHdUG+9pP1Tw=="
     },
     "unique-string": {
       "version": "2.0.0",

services/docstore/package.json

@@ -32,7 +32,7 @@
     "request": "^2.88.2",
     "settings-sharelatex": "^1.1.0",
     "streamifier": "^0.1.1",
-    "underscore": "~1.10.2"
+    "underscore": "~1.12.1"
   },
   "devDependencies": {
     "@google-cloud/storage": "^5.1.2",