Update dependency postcss-loader to v7 - autoclosed

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
postcss-loader	6.2.1 -> 7.0.0

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Release Notes

webpack-contrib/postcss-loader

### [`v7.0.0`](https://togithub.com/webpack-contrib/postcss-loader/blob/HEAD/CHANGELOG.md#​700-httpsgithubcomwebpack-contribpostcss-loadercomparev621v700-2022-05-18) [Compare Source](https://togithub.com/webpack-contrib/postcss-loader/compare/v6.2.1...v7.0.0) ##### ⚠ BREAKING CHANGES - minimum supported `Node.js` version is `14.15.0` ##### [6.2.1](https://togithub.com/webpack-contrib/postcss-loader/compare/v6.2.0...v6.2.1) (2021-11-26) ##### Bug Fixes - watching configuration ([#​553](https://togithub.com/webpack-contrib/postcss-loader/issues/553)) ([7f165b4](https://togithub.com/webpack-contrib/postcss-loader/commit/7f165b4991b59085651b517d960556a77b72a4d6))

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Configuration

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