Update dependency postcss-import to v13 - autoclosed

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
postcss-import	12.0.1 -> 13.0.0

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Release Notes

postcss/postcss-import

### [`v13.0.0`](https://togithub.com/postcss/postcss-import/blob/master/CHANGELOG.md#​1300--2020-10-20) [Compare Source](https://togithub.com/postcss/postcss-import/compare/12.0.1...13.0.0) - **BREAKING:** Require Node 10+ ([#​429](https://togithub.com/postcss/postcss-import/pull/429)) - **BREAKING:** Upgrade to postcss v8 and require it as a `peerDependency` ([#​427](https://togithub.com/postcss/postcss-import/issues/427), [#​432](https://togithub.com/postcss/postcss-import/pull/432)) - Update dependencies

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