chore(deps): Bump underscore in /build/frontend-legacy

Bumps [underscore](https://github.com/jashkenas/underscore) from 1.13.7 to 1.13.8.
- [Commits](https://github.com/jashkenas/underscore/commits)

---
updated-dependencies:
- dependency-name: underscore
  dependency-version: 1.13.8
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

build/frontend-legacy/package-lock.json

@@ -85,7 +85,7 @@
     "snap.js": "^2.0.9",
     "strengthify": "github:nextcloud/strengthify#0.5.9",
     "throttle-debounce": "^5.0.2",
-    "underscore": "1.13.7",
+    "underscore": "1.13.8",
     "v-click-outside": "^3.2.0",
     "v-tooltip": "^2.1.3",
     "vue": "^2.7.16",