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](sass/node-sass@v4.13.1...v7.0.0)

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

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

Author: dependabot[bot]

packages/sass/package.json

@@ -17,7 +17,7 @@
   "dependencies": {
     "css-loader": "^3.5.2",
     "lodash": "^4.17.15",
-    "node-sass": "^4.13.1",
+    "node-sass": "^7.0.0",
     "sass-loader": "^8.0.2",
     "style-loader": "^1.1.4"
   },

packages/webpack/package.json

@@ -33,7 +33,7 @@
     "extract-text-webpack-plugin": "^4.0.0-beta.0",
     "jsdom": "^16.5.0",
     "mz": "^2.7.0",
-    "node-sass": "^4.12.0",
+    "node-sass": "^7.0.0",
     "postcss-loader": "^3.0.0",
     "postcss-simple-vars": "^5.0.1",
     "sass-loader": "^7.1.0",