Bump ejs, webpack-bundle-analyzer and webpack-config-single-spa-react

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


Removes `ejs`

Updates `webpack-bundle-analyzer` from 3.8.0 to 4.10.1
- [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-contrib/webpack-bundle-analyzer@v3.8.0...v4.10.1)

Updates `webpack-config-single-spa-react` from 1.9.0 to 4.0.5
- [Release notes](https://github.com/single-spa/create-single-spa/releases)
- [Commits](https://github.com/single-spa/create-single-spa/compare/v1.9.0...webpack-config-single-spa-react@4.0.5)

---
updated-dependencies:
- dependency-name: ejs
  dependency-type: indirect
- dependency-name: webpack-bundle-analyzer
  dependency-type: direct:development
- dependency-name: webpack-config-single-spa-react
  dependency-type: direct:development
...

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