build(deps-dev): bump node-sass from 4.10.0 to 4.11.0 in /ui

Bumps [node-sass](https://github.com/sass/node-sass) from 4.10.0 to 4.11.0.
- [Release notes](https://github.com/sass/node-sass/releases)
- [Changelog](https://github.com/sass/node-sass/blob/master/CHANGELOG.md)
- [Commits](https://github.com/sass/node-sass/compare/v4.10.0...v4.11.0)

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

ui/package.json

@@ -62,7 +62,7 @@
     "jest-date-mock": "1.0.6",
     "jest-fetch-mock": "2.0.1",
     "markdownlint-cli": "0.13.0",
-    "node-sass": "4.10.0"
+    "node-sass": "4.11.0"
   },
   "browserslist": [
     ">= 1%",

ui/yarn.lock

@@ -7553,10 +7553,10 @@ node-releases@^1.0.0-alpha.11, node-releases@^1.0.1:
   dependencies:
     semver "^5.3.0"
 
-node-sass@4.10.0:
-  version "4.10.0"
-  resolved "https://registry.yarnpkg.com/node-sass/-/node-sass-4.10.0.tgz#dcc2b364c0913630945ccbf7a2bbf1f926effca4"
-  integrity sha512-fDQJfXszw6vek63Fe/ldkYXmRYK/QS6NbvM3i5oEo9ntPDy4XX7BcKZyTKv+/kSSxRtXXc7l+MSwEmYc0CSy6Q==
+node-sass@4.11.0:
+  version "4.11.0"
+  resolved "https://registry.yarnpkg.com/node-sass/-/node-sass-4.11.0.tgz#183faec398e9cbe93ba43362e2768ca988a6369a"
+  integrity sha512-bHUdHTphgQJZaF1LASx0kAviPH7sGlcyNhWade4eVIpFp6tsn7SV8xNMTbsQFpEV9VXpnwTTnNYlfsZXgGgmkA==
   dependencies:
     async-foreach "^0.1.3"
     chalk "^1.1.1"