Bump node-sass from 4.12.0 to 7.0.0

Bumps [node-sass](https://github.com/sass/node-sass) from 4.12.0 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@v4.12.0...v7.0.0)

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

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

package.json

@@ -189,7 +189,7 @@
         "jest-transform-stub": "^2.0.0",
         "json-stringify-pretty-compact": "^2.0.0",
         "less-loader": "^4.1.0",
-        "node-sass": "^4.12.0",
+        "node-sass": "^7.0.0",
         "prettier": "^2.2.1",
         "raw-loader": "^0.5.1",
         "react-svg-loader": "^2.1.0",