Bump node-sass from 4.9.2 to 7.0.0

Bumps [node-sass](https://github.com/sass/node-sass) from 4.9.2 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/v4.9.2...v7.0.0)

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

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

package.json

@@ -20,7 +20,7 @@
   "devDependencies": {
     "file-saver": "^1.3.8",
     "jszip": "^3.1.5",
-    "node-sass": "^4.9.2",
+    "node-sass": "^7.0.0",
     "sass.js": "^0.10.10"
   },
   "keywords": [