Bump node-sass from 6.0.1 to 7.0.0 in /frontend

Bumps [node-sass](https://github.com/sass/node-sass) from 6.0.1 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@v6.0.1...v7.0.0)

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

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

Author: dependabot[bot]

frontend/package-lock.json

@@ -32,7 +32,7 @@
     "jquery": "^3.6.0",
     "jsdom": "^16.7.0",
     "mocha": "^8.4.0",
-    "node-sass": "^6.0.1",
+    "node-sass": "^7.0.0",
     "npm-watch": "^0.7.0",
     "popper.js": "^1.16.1",
     "sass": "^1.32.12",