Bump node-sass from 4.14.1 to 5.0.0

Bumps [node-sass](https://github.com/sass/node-sass) from 4.14.1 to 5.0.0.
- [Release notes](https://github.com/sass/node-sass/releases)
- [Changelog](https://github.com/sass/node-sass/blob/master/CHANGELOG.md)
- [Commits](sass/node-sass@v4.14.1...v5.0.0)

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

package.json

@@ -70,7 +70,7 @@
     "load-grunt-tasks": "^5.1.0",
     "markdown-it-anchor": "^7.0.1",
     "mocha": "^8.1.1",
-    "node-sass": "^4.14.1",
+    "node-sass": "^5.0.0",
     "rollup": "^2.32.1",
     "rollup-plugin-insert": "^1.3.1",
     "rollup-plugin-terser": "^7.0.2",