Bump ejs, nightwatch and webpack-bundle-analyzer in /ui

Bumps [ejs](https://github.com/mde/ejs), [nightwatch](https://github.com/nightwatchjs/nightwatch) and [webpack-bundle-analyzer](https://github.com/webpack-contrib/webpack-bundle-analyzer). These dependencies needed to be updated together.

Updates `ejs` from 2.5.7 to 3.1.8
- [Release notes](https://github.com/mde/ejs/releases)
- [Changelog](https://github.com/mde/ejs/blob/main/CHANGELOG.md)
- [Commits](mde/ejs@v2.5.7...v3.1.8)

Updates `nightwatch` from 0.9.21 to 2.3.6
- [Release notes](https://github.com/nightwatchjs/nightwatch/releases)
- [Commits](https://github.com/nightwatchjs/nightwatch/commits/v2.3.6)

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: nightwatch
  dependency-type: direct:development
- dependency-name: webpack-bundle-analyzer
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]