build(deps-dev): bump node-sass from 5.0.0 to 7.0.0

Bumps [node-sass](https://github.com/sass/node-sass) from 5.0.0 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/v5.0.0...v7.0.0)

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

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

package.json

@@ -62,7 +62,7 @@
     "markdownlint-cli": "^0.27.1",
     "merge": "^2.1.1",
     "minify": "^7.0.1",
-    "node-sass": "^5.0.0",
+    "node-sass": "^7.0.0",
     "prettier": "^2.2.1",
     "stylelint": "^13.12.0",
     "stylelint-a11y": "^1.2.3",