Update dependency postcss-custom-properties to v13

This MR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
postcss-custom-properties (source)	^10.0.0 -> ^13.0.0

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Release Notes

csstools/postcss-plugins

v13.1.4

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• Fixed: exception on chained variable declarations.

v13.1.3

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• Fixed: exception on missing variables.

v13.1.2

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• Do not apply fallback values when these contain unresolvable custom properties.

v13.1.1

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• Improve types declaration in package.json

v13.1.0

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• Added: Support for Cascade Layers.
• Improve plugin performance (port of fixes in v12.1.11)

v13.0.0

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• Updated: Support for Node v14+ (major).
• Removed : importFrom feature (breaking).
• Removed : exportTo feature (breaking).
• Added support for local custom property declarations.

.example {
	--a-value: 20px;
	margin: var(--a-value);
}

/* becomes */

.example {
	--a-value: 20px;
	margin: 20px;
	margin: var(--a-value);
}

v12.1.11

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• Improve plugin performance

v12.1.10

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• Fix how preserve: false interacts with logic around duplicate code (see 12.1.9).

:root {
	--my-order: 1;
}

.foo {
	order: 1;
	order: var(--my-order);
}

/* With `preserve: false` : */

.foo {
	order: 1;
}

v12.1.9

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• Prevent duplicate code generation.

.foo {
	order: 1;
	order: var(--my-order, 1);
}

/* becomes */

.foo {
	order: 1;
- 	order: 1;
	order: var(--my-order, 1);
}

v12.1.8

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• Remove some unneeded regular expressions.

v12.1.7

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• Fix racing condition that could happen when using other async PostCSS plugins (#​331)

v12.1.6

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• Fix var() fallback value downgrades with value lists.

v12.1.5

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• Add deprecation notice for importFrom and exportTo

see the discussion

v12.1.4

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• Fix .mjs in importFrom when using export default
• Fix .mjs in importFrom on Windows

v12.1.3

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• Reset plugin state after each process. It is now safe to use the plugin multiple times for different processes or when watching.

v12.1.2

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• Fix TypeScript transpilation.
• Avoid throwing errors on unexpected option objects.

v12.1.1

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• Improve plugin performance

v12.1.0

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• Add overrideImportFromWithRoot option
• Allow .mjs in importFrom
• Converted to TypeScript
• Correct typings for plugin options
• Fix unicode support in custom property names

v12.0.4

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• Fixed an issue that was causing synchronous mode to not being able to pick and transform properties that were added as part of the PostCSS flow. (#​132)

v12.0.3

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v12.0.2

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• Removed Sourcemaps from package tarball.
• Moved CLI to CLI Package. See announcement.

v12.0.1

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• Changed: now uses postcss-value-parser for parsing.
• Updated: documentation

v12.0.0

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

v11.0.0

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• Added: Support for PostCSS v8.

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