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:production
...

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

package.json

@@ -34,7 +34,7 @@
     "leaflet-editable": "^1.1.0",
     "leaflet-routing-machine": "^3.2.12",
     "leaflet.markercluster": "^1.4.1",
-    "node-sass": "^5.0.0",
+    "node-sass": "^7.0.0",
     "pt-sans-cyrillic": "0.0.4",
     "raleway-cyrillic": "^4.0.2",
     "ramda": "^0.26.1",