Bump webpack-bundle-analyzer in /mooring/frontend/mooring

Bumps [webpack-bundle-analyzer](https://github.com/webpack-contrib/webpack-bundle-analyzer) from 2.13.1 to 3.7.0.
- [Release notes](https://github.com/webpack-contrib/webpack-bundle-analyzer/releases)
- [Changelog](https://github.com/webpack-contrib/webpack-bundle-analyzer/blob/master/CHANGELOG.md)
- [Commits](webpack-contrib/webpack-bundle-analyzer@v2.13.1...v3.7.0)

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

mooring/frontend/mooring/package.json

@@ -69,7 +69,7 @@
     "vue-style-loader": "^2.0.0",
     "vue-template-compiler": "^2.4.4",
     "webpack": "^2.7.0",
-    "webpack-bundle-analyzer": "^2.2.1",
+    "webpack-bundle-analyzer": "^3.7.0",
     "webpack-dev-middleware": "^1.10.0",
     "webpack-hot-middleware": "^2.16.1",
     "webpack-merge": "^2.6.1"