Bump ejs and webpack-bundle-analyzer

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 3.9.0 to 4.6.1
- [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](https://github.com/webpack-contrib/webpack-bundle-analyzer/commits/v4.6.1)

---
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>

package.json

@@ -66,7 +66,7 @@
     "style-loader": "^1.3.0",
     "url-loader": "^4.1.1",
     "webpack": "^4.46.0",
-    "webpack-bundle-analyzer": "^3.9.0",
+    "webpack-bundle-analyzer": "^4.6.1",
     "webpack-cli": "^3.3.12",
     "webpack-dev-server": "^3.11.3"
   },