chore(deps): update dependency @csstools/postcss-cascade-layers to v6

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
@csstools/postcss-cascade-layers (source)	5.0.2 → 6.0.0

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Release Notes

csstools/postcss-plugins (@​csstools/postcss-cascade-layers)

v6.0.0

Compare Source

January 14, 2026

• Updated: Support for Node 20.19.0 or later (major).
• Removed: commonjs API. In supported Node versions require(esm) will work without needing to make code changes.
• Updated @csstools/selector-specificity to 6.0.0 (major)

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