chore(deps): update dependency css-minimizer-webpack-plugin to v6

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
css-minimizer-webpack-plugin	^5.0.1 -> ^6.0.0

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Release Notes

webpack-contrib/css-minimizer-webpack-plugin (css-minimizer-webpack-plugin)

### [`v6.0.0`](https://togithub.com/webpack-contrib/css-minimizer-webpack-plugin/blob/HEAD/CHANGELOG.md#600-2024-01-17) [Compare Source](https://togithub.com/webpack-contrib/css-minimizer-webpack-plugin/compare/v5.0.1...v6.0.0) ##### ⚠ BREAKING CHANGES - minimum supported Node.js version is `18.12.0` ([#​252](https://togithub.com/webpack-contrib/css-minimizer-webpack-plugin/issues/252)) ([f7f74c0](https://togithub.com/webpack-contrib/css-minimizer-webpack-plugin/commit/f7f74c02c8a53e517d9942807c198d1daff0c4b5)) ##### [5.0.1](https://togithub.com/webpack-contrib/css-minimizer-webpack-plugin/compare/v5.0.0...v5.0.1) (2023-06-13) ##### Bug Fixes - improve perf ([#​235](https://togithub.com/webpack-contrib/css-minimizer-webpack-plugin/issues/235)) ([959eb89](https://togithub.com/webpack-contrib/css-minimizer-webpack-plugin/commit/959eb89aa1e37df88d2decbe6f40c096f10a3745))

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Configuration

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