Update dependency postcss to v8.2.13

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
postcss (source)	^8.2.2 -> 8.2.13

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Release Notes

postcss/postcss

v8.2.13

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• Fixed ReDoS vulnerabilities in source map parsing (by Yeting Li).

v8.2.12

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• Fixed package.json exports.

v8.2.11

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• Fixed DEP0148 warning in Node.js 16.
• Fixed docs (by @​semiromid).

v8.2.10

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• Fixed ReDoS vulnerabilities in source map parsing.
• Fixed webpack 5 support (by Barak Igal).
• Fixed docs (by Roeland Moors).

v8.2.9

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• Exported NodeErrorOptions type (by Rouven Weßling).

v8.2.8

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• Fixed browser builds in webpack 4 (by Matt Jones).

v8.2.7

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• Fixed browser builds in webpack 5 (by Matt Jones).

v8.2.6

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• Fixed Maximum call stack size exceeded in Node#toJSON.
• Fixed docs (by inokawa).

v8.2.5

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• Fixed escaped characters handling in list.split (by Natalie Weizenbaum).

v8.2.4

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• Added plugin name to postcss.plugin() warning (by Tom Williams).
• Fixed docs (by Bill Columbia).

v8.2.3

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• Fixed JSON.stringify(Node[]) support (by Niklas Mischkulnig).

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