Bump node-sass from 4.10.0 to 7.0.0

Bumps [node-sass](https://github.com/sass/node-sass) from 4.10.0 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/v4.10.0...v7.0.0)

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

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

package.json

@@ -16,7 +16,7 @@
     "mapbox-gl": "^0.53.0",
     "mapbox-gl-vue": "^1.9.0",
     "moment": "^2.24.0",
-    "node-sass": "^4.9.2",
+    "node-sass": "^7.0.0",
     "sass-loader": "^7.0.3",
     "vue": "^2.5.2",
     "vue-axios": "^2.1.2",