Bump node-sass from 5.0.0 to 8.0.0 in /Tools/GitHub-style-generator

Bumps [node-sass](https://github.com/sass/node-sass) from 5.0.0 to 8.0.0.
- [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...v8.0.0)

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

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

Tools/GitHub-style-generator/package.json

@@ -9,7 +9,7 @@
   "author": "Franklin Yu",
   "license": "MIT",
   "dependencies": {
-    "node-sass": "^5.0.0",
+    "node-sass": "^8.0.0",
     "primer-markdown": "^4.0.0"
   }
 }