build(deps-dev): bump webpack-merge from 4.2.2 to 5.0.9 in /html (#407)

build(deps-dev): bump webpack-merge from 4.2.2 to 5.0.9 in /html (#407)

* build(deps-dev): bump webpack-merge from 4.2.2 to 5.0.9 in /html

Bumps [webpack-merge](https://github.com/survivejs/webpack-merge) from 4.2.2 to 5.0.9.
- [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/v4.2.2...v5.0.9)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>
* webpack-merge: fix compatibility

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>
Co-authored-by: Shuanglei Tao <tsl0922@gmail.com>