build(deps-dev): bump node-sass from 8.0.0 to 9.0.0

Bumps [node-sass](https://github.com/sass/node-sass) from 8.0.0 to 9.0.0.
- [Release notes](https://github.com/sass/node-sass/releases)
- [Changelog](https://github.com/sass/node-sass/blob/master/CHANGELOG.md)
- [Commits](sass/node-sass@v8.0.0...v9.0.0)

---
updated-dependencies:
- dependency-name: node-sass
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package.json

@@ -16,7 +16,7 @@
   "devDependencies": {
     "chai": "4.3.7",
     "grunt": "1.6.1",
-    "node-sass": "8.0.0",
+    "node-sass": "9.0.0",
     "grunt-available-tasks": "0.6.3",
     "grunt-bower-installer": "0.3.6",
     "grunt-contrib-clean": "2.0.1",