chore(deps): update dependency postcss-loader to v7

This MR contains the following updates:

Package	Type	Update	Change
postcss-loader	devDependencies	major	^6.2.0 -> ^7.0.0

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Release Notes

webpack-contrib/postcss-loader (postcss-loader)

v7.3.3

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v7.3.2

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v7.3.1

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v7.3.0

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Features

• use jiti for typescript configurations (#​649) (8b876fa)

7.2.4 (2023-04-04)

Bug Fixes

• memory leak (#​642) (7ab3b59)

7.2.3 (2023-04-03)

Bug Fixes

• ts-node loading (#​640) (38b1992)

7.2.2 (2023-04-03)

Bug Fixes

• cannot find module 'ts-node' (#​639) (ab4d16a)

7.2.1 (2023-04-03)

Bug Fixes

• cosmiconfig typescript loader (#​635) (129f5be)

v7.2.4

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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)

v7.1.0

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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)

v7.0.2

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v7.0.1

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v7.0.0

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⚠ BREAKING CHANGES

• minimum supported Node.js version is 14.15.0

6.2.1 (2021-11-26)

Bug Fixes

• watching configuration (#​553) (7f165b4)

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