Bump sass-loader from 12.6.0 to 13.0.0

Bumps [sass-loader](https://github.com/webpack-contrib/sass-loader) from 12.6.0 to 13.0.0.
- [Release notes](https://github.com/webpack-contrib/sass-loader/releases)
- [Changelog](https://github.com/webpack-contrib/sass-loader/blob/master/CHANGELOG.md)
- [Commits](webpack-contrib/sass-loader@v12.6.0...v13.0.0)

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

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

package.json

@@ -43,7 +43,7 @@
 		"postcss-loader": "^7.0.0",
 		"postcss-preset-env": "^7.5.0",
 		"prettier": "npm:wp-prettier@^2.6.2-beta-1",
-		"sass-loader": "^12.6.0",
+		"sass-loader": "^13.0.0",
 		"stylelint-config-prettier": "^9.0.3",
 		"stylelint-webpack-plugin": "^3.2.0",
 		"svg-spritemap-webpack-plugin": "git://github.com/cascornelissen/svg-spritemap-webpack-plugin.git#500280acbf4517319e57e951a44db524060dc105",