Bump ejs and webpack-bundle-analyzer in /example

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 3.6.0 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](webpack/webpack-bundle-analyzer@v3.6.0...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] <[email protected]>

Author: dependabot[bot]

example/package-lock.json

@@ -85,7 +85,7 @@
         "uglifyjs-webpack-plugin": "^2.2.0",
         "url-loader": "1.1.2",
         "webpack": "4.43.0",
-        "webpack-bundle-analyzer": "3.6.0",
+        "webpack-bundle-analyzer": "4.6.1",
         "webpack-cli": "3.3.11",
         "webpack-dev-server": "3.11.0",
         "webpack-merge": "^4.2.2"