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:production
...

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

package.json

@@ -44,7 +44,7 @@
     "gulp-sass": "^4.0.1",
     "html-webpack-plugin": "^3.2.0",
     "json-server": "^0.14.0",
-    "node-sass": "^4.9.2",
+    "node-sass": "^7.0.0",
     "octonode": "^0.9.2",
     "popper": "1.0.1",
     "raw-loader": "^0.5.1",