Update dependency postcss-loader to v8

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
postcss-loader	^7.0.0 -> ^8.0.0

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Release Notes

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

v8.1.1

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v8.1.0

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Features

• add @rspack/core as an optional peer dependency (#​679) (512e4c3)

v8.0.0

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⚠ BREAKING CHANGES

• minimum supported Node.js version is 18.12.0 (#​677) (8dd0315)

7.3.4 (2023-12-27)

Bug Fixes

• do not crash if pkg.(d|devD)ependencies unset (#​667) (8ef0c7e)

7.3.3 (2023-06-10)

Bug Fixes

• perf: avoid using klona for postcss options (#​658) (e754c3f)
• bug with loading configurations after updating cosmiconfig to version 8.2 (684d265)

7.3.2 (2023-05-28)

Bug Fixes

• use cause to keep original errors and warnings (#​655) (e8873f4)

7.3.1 (2023-05-26)

Bug Fixes

• warning and error serialization (65748ec)

v7.3.4

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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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⚠️ Visual regression found! Please check if this change is wanted or accidental. You can check the output here: https://city-of-helsinki.github.io/drupal-hdbt/pull/881/html_report/