Upgrade: Bump node-sass from 4.13.1 to 7.0.0

Bumps [node-sass](https://github.com/sass/node-sass) from 4.13.1 to 7.0.0.
- [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/v4.13.1...v7.0.0)

---
updated-dependencies:
- dependency-name: node-sass
  dependency-type: direct:development
...

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

package.json

@@ -386,7 +386,7 @@
     "jest-watch-typeahead": "^0.4.0",
     "mocha": "^6.1.4",
     "module-alias": "^2.2.2",
-    "node-sass": "^4.13.0",
+    "node-sass": "^7.0.0",
     "rewire": "^4.0.1",
     "sass-loader": "^7.2.0",
     "terser-webpack-plugin": "^1.4.1",