Bump node-sass from 4.9.3 to 7.0.0

Bumps [node-sass](https://github.com/sass/node-sass) from 4.9.3 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](sass/node-sass@v4.9.3...v7.0.0)

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

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

Author: dependabot[bot]

package.json

@@ -16,7 +16,7 @@
     "css-loader": "^1.0.0",
     "file-loader": "^2.0.0",
     "jest": "^23.6.0",
-    "node-sass": "^4.9.3",
+    "node-sass": "^7.0.0",
     "sass-loader": "^7.1.0",
     "source-map-loader": "^0.2.4",
     "style-loader": "^0.23.0",