fix(deps): update dependency css-minimizer-webpack-plugin to v8

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
css-minimizer-webpack-plugin	7.0.4 → 8.0.0

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Release Notes

webpack/css-minimizer-webpack-plugin (css-minimizer-webpack-plugin)

v8.0.0

Compare Source

⚠ BREAKING CHANGES

• minimum supported Node.js version is 20.9.0 (#​303) (8791cc2)

7.0.4 (2025-12-11)

Bug Fixes

• handle empty files (#​295) (8b273d1)

7.0.3 (2025-12-05)

Bug Fixes

• respect errors and warnings from minimizer without code (933fb49)

7.0.2 (2025-03-06)

Bug Fixes

• better types (9d009b3)

7.0.1 (2025-03-06)

Bug Fixes

• better support worker threads (eeaa5e1)
• use os.availableParallelism() for parallelism when it is available (b07feeb)

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