chore(deps): update dependency postcss-loader to v7

[renovate]

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

v7.0.1

Compare Source

v7.0.0

Compare Source

⚠ BREAKING CHANGES

• minimum supported Node.js version is 14.15.0

6.2.1 (2021-11-26)

Bug Fixes

• watching configuration (#​553) (7f165b4)

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Configuration

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