Bump node-sass from 4.13.1 to 7.0.0

Bumps [node-sass](https://github.com/sass/node-sass) from 4.13.1 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](https://github.com/sass/node-sass/compare/v4.13.1...v7.0.0)

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

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

package.json

@@ -34,7 +34,7 @@
         "html-webpack-inline-source-plugin": "0.0.10",
         "html-webpack-plugin": "^3.2.0",
         "mini-css-extract-plugin": "^0.8.0",
-        "node-sass": "^4.13.1",
+        "node-sass": "^7.0.0",
         "optimize-css-assets-webpack-plugin": "^5.0.3",
         "sass-loader": "^7.1.0",
         "style-loader": "^0.23.1",