Update dependency postcss-loader to v6.2.0

This MR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
postcss-loader	6.1.1 -> 6.2.0

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Release Notes

webpack-contrib/postcss-loader

v6.2.0

Compare Source

Features

• add link field in schema (#​540) (1ae8212)

6.1.1 (2021-07-01)

Bug Fixes

• do not swallow exception from postcss (2eec42b)

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