build(deps-dev): bump sass-loader from 12.3.0 to 12.4.0

Bumps [sass-loader](https://github.com/webpack-contrib/sass-loader) from 12.3.0 to 12.4.0.
- [Release notes](https://github.com/webpack-contrib/sass-loader/releases)
- [Changelog](https://github.com/webpack-contrib/sass-loader/blob/master/CHANGELOG.md)
- [Commits](https://github.com/webpack-contrib/sass-loader/compare/v12.3.0...v12.4.0)

---
updated-dependencies:
- dependency-name: sass-loader
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

package.json

@@ -78,7 +78,7 @@
     "prop-types": "15.7.2",
     "redux-mock-store": "1.5.4",
     "sass": "1.44.0",
-    "sass-loader": "^12.3.0",
+    "sass-loader": "^12.4.0",
     "stylelint": "13.13.1",
     "stylelint-config-recommended-scss": "4.3.0",
     "stylelint-scss": "3.21.0",