build: update postcss-loader to version 4.0.3

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
postcss-loader	dependencies	patch	4.0.2 -> 4.0.3
postcss-loader	devDependencies	patch	4.0.2 -> 4.0.3

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Release Notes

webpack-contrib/postcss-loader

v4.0.3

Compare Source

Bug Fixes

• PostCSS 8 plugin loading (e1b82fe)
• error and warning messages (#​485) (4b44e01)

4.0.2 (2020-09-15)

Bug Fixes

• compatibility with postcss@8 (#​479) (218b0f8)

4.0.1 (2020-09-08)

Bug Fixes

• source map generation with the map option for postcss (#​476) (6babeb1)

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