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

@@ -56,7 +56,7 @@
     "pug-loader": "^2.4.0",
     "pug-static-loader": "2.0.0",
     "raw-loader": "4.0.2",
-    "sass-loader": "^12.3.0",
+    "sass-loader": "^12.4.0",
     "shell-quote": "^1.7.3",
     "shelljs": "0.8.4",
     "slugify": "^1.6.1",