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](sass/node-sass@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

@@ -5,7 +5,7 @@
   "dependencies": {
     "bootstrap": "^4.3.1",
     "chart.js": "^3.2.0",
-    "node-sass": "^5.0.0",
+    "node-sass": "^7.0.0",
     "react": "^17.0.2",
     "react-bootstrap": "^1.0.1",
     "react-chartjs-2": "^3.0.2",