Update dependency postcss-loader to v7.2.3

This MR contains the following updates:

Package	Type	Update	Change
postcss-loader	devDependencies	minor	7.1.0 -> 7.2.3

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Release Notes

webpack-contrib/postcss-loader

v7.2.3

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v7.2.2

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v7.2.1

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v7.2.0

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Features

• add support for TypeScript based configs (#​632) (c6b5def)

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Configuration

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