Bump vue-loader from 15.8.3 to 15.9.0 in /js

Bumps [vue-loader](https://github.com/vuejs/vue-loader) from 15.8.3 to 15.9.0.
- [Release notes](https://github.com/vuejs/vue-loader/releases)
- [Changelog](https://github.com/vuejs/vue-loader/blob/master/CHANGELOG.md)
- [Commits](https://github.com/vuejs/vue-loader/compare/v15.8.3...v15.9.0)

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

js/package.json

@@ -36,7 +36,7 @@
     "mini-css-extract-plugin": "^0.9.0",
     "style-loader": "^1.1.3",
     "url-loader": "^3.0.0",
-    "vue-loader": "^15.8.3",
+    "vue-loader": "^15.9.0",
     "vue-style-loader": "^4.1.2",
     "vue-template-compiler": "^2.6.11",
     "webpack": "^4.41.6",