Bump node-sass from 4.14.1 to 5.0.0 in /swift_browser_ui_frontend

Bumps [node-sass](https://github.com/sass/node-sass) from 4.14.1 to 5.0.0.
- [Release notes](https://github.com/sass/node-sass/releases)
- [Changelog](https://github.com/sass/node-sass/blob/master/CHANGELOG.md)
- [Commits](sass/node-sass@v4.14.1...v5.0.0)

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

Author: dependabot[bot]

swift_browser_ui_frontend/package-lock.json

@@ -15,7 +15,7 @@
     "core-js": "^3.8.3",
     "lodash": "^4.17.20",
     "material-design-icons": "^3.0.1",
-    "node-sass": "^4.14.1",
+    "node-sass": "^5.0.0",
     "resumablejs": "^1.1.0",
     "sass-loader": "^7.3.1",
     "serve": "^11.3.2",