Update dependency postcss-import to v16

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
postcss-import	14.1.0 -> 16.1.0

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Release Notes

postcss/postcss-import (postcss-import)

v16.1.0

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• Allow bundling URLs with fragments (useful for Vite users) (#​560, #​561)

v16.0.1

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• Fix crash when handling some @imports with media conditions (#​557, #​558)

v16.0.0

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• BREAKING: Require Node.js v18+ (#​550, #​551)
• BREAKING: Signifigant rewrite, with small behavioral tweaks in a number of edge cases
• Support for @supports conditional imports added (#​532, #​548)
• When skipDuplicates is false, handles import cycles correctly (#​462, #​535)
• Add warnOnEmpty option to allow disabling warnings for empty files (#​84, #​541)
• Use proper node.errors (#​518, #​540)

Huge thanks to @romainmenke for all the hard work he put into this release.

v15.1.0

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• Add data: URL support (this is not useful for most consumers) (#​515)

v15.0.1

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• Preserve layer in ignored @imports (#​510, #​511)
• Join media queries in the correct order (#​512, #​513)

v15.0.0

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• BREAKING: Require Node.js v14+ (#​497)
• BREAKING: Require nameLayer option for handling anonymous layers (#​496)
• Fix handling of @media queries inside layered imports (#​495, #​496)

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