Update dependency postcss-import to v15 - autoclosed

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
postcss-import	^12.0.1 -> ^15.0.0

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Release Notes

postcss/postcss-import (postcss-import)

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)

v14.1.0

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• Add @layer support (#​483)

v14.0.2

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• Remove remaining direct import of postcss package (#​455, #​456)

v14.0.1

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• Fix bug with @charset statements in media imports (#​448, #​453)

v14.0.0

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This release should not have breaking changes for the vast majority of users; only those with @charset statements in their CSS may be affected.

• BREAKING: Error if multiple incompatible @charset statements (#​447)
• BREAKING: Warn if @charset statements are not at the top of files (#​447)
• Fix handing of @charset (#​436, #​447)

v13.0.0

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• BREAKING: Require Node 10+ (#​429)
• BREAKING: Upgrade to postcss v8 and require it as a peerDependency (#​427, #​432)
• Update dependencies

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This change is marked as an internal change (Task), so will not be included in the changelog.