Bump node-sass from 4.14.1 to 7.0.0

Bumps [node-sass](https://github.com/sass/node-sass) from 4.14.1 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@v4.14.1...v7.0.0)

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

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

package.json

@@ -18,7 +18,7 @@
     "avril": "StartupsPoleEmploi/avril-shared",
     "buefy": "^0.8.11",
     "cookie-universal-nuxt": "^2.1.0",
-    "node-sass": "^4.13.1",
+    "node-sass": "^7.0.0",
     "nuxt": "^2.0.0",
     "nuxt-svg-loader": "^1.2.0",
     "sass-loader": "^8.0.2",