build: update dependency stylus-loader to v6

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
stylus-loader	5.0.0 -> 6.0.0

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Release Notes

webpack-contrib/stylus-loader

v6.0.0

Compare Source

⚠ BREAKING CHANGES

• minimum supported Node.js version is 12.13.0

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Configuration

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