Bump webpack-bundle-analyzer from 3.7.0 to 3.8.0 (#13909)

Bumps [webpack-bundle-analyzer](https://github.com/webpack-contrib/webpack-bundle-analyzer) from 3.7.0 to 3.8.0.
- [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](https://github.com/webpack-contrib/webpack-bundle-analyzer/compare/v3.7.0...v3.8.0

)

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