Bump node-sass from 4.12.0 to 4.13.0

Bumps [node-sass](https://github.com/sass/node-sass) from 4.12.0 to 4.13.0.
- [Release notes](https://github.com/sass/node-sass/releases)
- [Changelog](https://github.com/sass/node-sass/blob/master/CHANGELOG.md)
- [Commits](https://github.com/sass/node-sass/compare/v4.12.0...v4.13.0)

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

package.json

@@ -25,7 +25,7 @@
     "json-loader": "0.5.7",
     "node-abi": "^2.11.0",
     "node-gyp": "^6.0.0",
-    "node-sass": "^4.12.0",
+    "node-sass": "^4.13.0",
     "npmlog": "4.1.2",
     "npx": "^10.2.0",
     "pug": "^2.0.4",