Bump webpack-merge from 5.1.4 to 5.2.0

Bumps [webpack-merge](https://github.com/survivejs/webpack-merge) from 5.1.4 to 5.2.0.
- [Release notes](https://github.com/survivejs/webpack-merge/releases)
- [Changelog](https://github.com/survivejs/webpack-merge/blob/master/CHANGELOG.md)
- [Commits](https://github.com/survivejs/webpack-merge/compare/v5.1.4...v5.2.0

)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>