build(deps-dev): bump webpack-merge from 5.1.1 to 5.1.2 in /html (#449)

build(deps-dev): bump webpack-merge from 5.1.1 to 5.1.2 in /html (#449)

Bumps [webpack-merge](https://github.com/survivejs/webpack-merge) from 5.1.1 to 5.1.2.
- [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/v5.1.1...v5.1.2)

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