Update dependency postcss-custom-properties to v13.3.8

This MR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
postcss-custom-properties (source)	13.3.0 -> 13.3.8

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Release Notes

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

v13.3.8

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April 22, 2024

• Fix an error when a custom property has multiple dependencies and one of them is undefined

v13.3.7

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April 11, 2024

• Improve handling of cross references between computed values of custom properties

v13.3.6

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March 13, 2024

• Updated @csstools/css-tokenizer to 2.2.4 (patch)
• Updated @csstools/css-parser-algorithms to 2.6.1 (patch)
• Updated @csstools/cascade-layer-name-parser to 1.0.9 (patch)

v13.3.5

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February 19, 2024

• Reuse code with @csstools/utilities
• Updated @csstools/css-parser-algorithms to 2.6.0 (minor)
• Updated @csstools/cascade-layer-name-parser to 1.0.8 (patch)

v13.3.4

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December 31, 2023

• Updated @csstools/css-tokenizer to 2.2.3 (patch)
• Updated @csstools/css-parser-algorithms to 2.5.0 (minor)
• Updated @csstools/cascade-layer-name-parser to 1.0.7 (patch)

v13.3.3

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December 15, 2023

• Fix type definitions
• Updated @csstools/css-tokenizer to 2.2.2 (patch)
• Updated @csstools/css-parser-algorithms to 2.4.0 (minor)
• Updated @csstools/cascade-layer-name-parser to 1.0.6 (patch)

v13.3.2

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September 24, 2023

• Updated @csstools/css-tokenizer to 2.2.1 (patch)
• Updated @csstools/css-parser-algorithms to 2.3.2 (patch)
• Updated @csstools/cascade-layer-name-parser to 1.0.5 (patch)

v13.3.1

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September 18, 2023

• Improve performance

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