Update dependency postcss-mixins to v10

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
postcss-mixins	^6.2.3 -> ^10.0.0

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Release Notes

postcss/postcss-mixins (postcss-mixins)

v10.0.0

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• Added single-arg() support (by @​pciarach).
• Removed Node.js 16 and 14 support.

v9.0.4

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• Moved to postcss-simple-vars 7.

v9.0.3

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• Fixed hot reload (by Andrey Grandilevskiy).
• Fixed Windows support (by Andrey Grandilevskiy).

v9.0.2

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• Fixed at-rules in @mixin-content in function mixins (by Vasily Polovnyov).
• Updated postcss-js.

v9.0.1

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• Reduced package size.

v9.0.0

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v8.1.0

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v8.0.0

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v7.0.3

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• Fixed file pattern on Windows (by Gene Alyson Fortunado Torcende).

v7.0.2

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• Fixed postcss-js loading (by Paul Welsh).

v7.0.1

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• Added funding links.

v7.0.0

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