chore(deps): update dependency postcss-loader to v4.2.0

This MR contains the following updates:

Package	Type	Update	Change
postcss-loader	devDependencies	minor	4.1.0 -> 4.2.0

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Release Notes

webpack-contrib/postcss-loader

v4.2.0

Compare Source

Features

• added the implementation option (#​511) (deac978)

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