Update dependency postcss-loader to v4.3.0

This MR contains the following updates:

Package	Type	Update	Change
postcss-loader	devDependencies	minor	4.0.3 -> 4.3.0

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Release Notes

webpack-contrib/postcss-loader

v4.3.0

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Features

• add support for dir-dependency message type (#​525) (554802e)

v4.2.0

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Features

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

v4.1.0

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Features

• partial compatibility with postcss-cli, added api.env (alias for api.mode) and api.options (contains options from the postcssOptions options), please look at the example for more details (#​498) (84a9c46)

4.0.4 (2020-10-09)

Chore

• update schema-utils

v4.0.4

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