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] <[email protected]>

Author: dependabot[bot]

package.json

@@ -26,7 +26,7 @@
     "jest": "^24.9.0",
     "jest-watch-typeahead": "^0.4.2",
     "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",
     "pnp-webpack-plugin": "^1.6.0",
     "postcss-flexbugs-fixes": "^4.2.0",