chore(deps): update dependency mini-css-extract-plugin to v1.6.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
mini-css-extract-plugin	1.5.1 -> 1.6.0

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Release Notes

webpack-contrib/mini-css-extract-plugin

### [`v1.6.0`](https://togithub.com/webpack-contrib/mini-css-extract-plugin/blob/master/CHANGELOG.md#​160-httpsgithubcomwebpack-contribmini-css-extract-plugincomparev151v160-2021-04-30) [Compare Source](https://togithub.com/webpack-contrib/mini-css-extract-plugin/compare/v1.5.1...v1.6.0) ##### Features - added new url support ([#​753](https://togithub.com/webpack-contrib/mini-css-extract-plugin/issues/753)) ([c76a1a1](https://togithub.com/webpack-contrib/mini-css-extract-plugin/commit/c76a1a16b926e3dc8f6763d940ab6e4eb170c77f)) ##### [1.5.1](https://togithub.com/webpack-contrib/mini-css-extract-plugin/compare/v1.5.0...v1.5.1) (2021-04-28) ##### Bug Fixes - compatibility with named export and es5 ([#​751](https://togithub.com/webpack-contrib/mini-css-extract-plugin/issues/751)) ([3be81bb](https://togithub.com/webpack-contrib/mini-css-extract-plugin/commit/3be81bb4e795fc9295c2c7e7a8bb71de9cead2d0))

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