Update dependency postcss-custom-properties to v15.0.3

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
postcss-custom-properties (source)	15.0.2 → 15.0.3

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Release Notes

csstools/postcss-plugins (postcss-custom-properties)

v15.0.3

Compare Source

October 1, 2026

• Updated @csstools/css-parser-algorithms to 4.0.2 (patch)
• Updated @csstools/cascade-layer-name-parser to 3.0.2 (patch)

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