Bump ejs and webpack-bundle-analyzer in /client

Removes [ejs](https://github.com/mde/ejs). It's no longer used after updating ancestor dependency [webpack-bundle-analyzer](https://github.com/webpack-contrib/webpack-bundle-analyzer). These dependencies need to be updated together.


Removes `ejs`

Updates `webpack-bundle-analyzer` from 3.4.1 to 4.8.0
- [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/webpack-bundle-analyzer@v3.4.1...v4.8.0)

---
updated-dependencies:
- dependency-name: ejs
  dependency-type: indirect
- dependency-name: webpack-bundle-analyzer
  dependency-type: direct:development
...

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

Author: dependabot[bot]

client/package-lock.json

@@ -59,7 +59,7 @@
     "vue-style-loader": "^2.0.0",
     "vue-template-compiler": "^2.5.16",
     "webpack": "^2.7.0",
-    "webpack-bundle-analyzer": "^3.3.2",
+    "webpack-bundle-analyzer": "^4.8.0",
     "webpack-dev-middleware": "^1.12.2",
     "webpack-hot-middleware": "^2.22.1",
     "webpack-merge": "^2.6.1"