Update dependency postcss-loader to v7.1.0

This MR contains the following updates:

Package	Type	Update	Change
postcss-loader	devDependencies	minor	7.0.2 -> 7.1.0

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Release Notes

webpack-contrib/postcss-loader

v7.1.0

Compare Source

Features

• deps: update cosmiconfig (#​628) (8114be4)

7.0.2 (2022-11-29)

Bug Fixes

• support ESM version of postcss.config.js and postcss.config.mjs (#​614) (955085f)

7.0.1 (2022-07-11)

Bug Fixes

• unexpected failing on CSS syntax error (#​593) (888d72e)

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