Bump node-sass from 4.14.1 to 7.0.0 in /client

Bumps [node-sass](https://github.com/sass/node-sass) from 4.14.1 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](sass/node-sass@v4.14.1...v7.0.0)

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

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

Author: dependabot[bot]

client/package.json

@@ -14,7 +14,7 @@
         "@types/react-dom": "^17.0.0",
         "axios": "^0.21.2",
         "http-proxy-middleware": "^1.3.1",
-        "node-sass": "^4.14.1",
+        "node-sass": "^7.0.0",
         "react": "^17.0.2",
         "react-dom": "^17.0.2",
         "react-router-dom": "^5.2.0",