chore(deps): update dependency postcss-custom-properties to v12

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
postcss-custom-properties	^11.0.0 -> ^12.0.0

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Release Notes

postcss/postcss-custom-properties

v12.0.0

Compare Source

• Updated: Support for PostCS 8+ (major).
• Updated: Support for Node 12+ (major).

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Configuration

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[codecov]

Codecov Report

Merging #383 (7bb2844) into main (55bdd8d) will not change coverage.
The diff coverage is n/a.

❗ Current head 7bb2844 differs from pull request most recent head 1490f21. Consider uploading reports for the commit 1490f21 to get more accurate results

@@           Coverage Diff           @@
##             main     #383   +/-   ##
=======================================
  Coverage   97.67%   97.67%           
=======================================
  Files           3        3           
  Lines          43       43           
  Branches       11       11           
=======================================
  Hits           42       42           
  Misses          1        1           

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