chore(deps): Update dependency postcss to v8.5.20

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
postcss (source)	8.5.8 → 8.5.20

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Release Notes

postcss/postcss (postcss)

v8.5.20

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• Fixed missing space if AtRule#params is set after (by @​sarathfrancis90).
• Fixed mixing AST error on warnings (by @​MahinAnowar).

v8.5.19

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• Fixed cleaning before for new nodes inserted to Root (by @​MahinAnowar).

v8.5.18

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• Restricted loading previous source maps file to the opts.from folder for security reasons (use unsafeMap: true to disable the check).

v8.5.17

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• Fixed Maximum call stack size exceeded error.
• Fixed Prototype hijacking for postcss.fromJSON().
• Fixed Input#origin() for unmapped end position (by @​chatman-media).

v8.5.16

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• Fixed Input#origin() position (by @​mizdra).
• Fixed raws after rehydrating a JSON AST (by @​sarathfrancis90).
• Fixed putting parent-less node in nodes of new node (by @​MahinAnowar).
• Fixed computing offset in positionBy() (by @​greymoth-jp).
• Fixed rangeBy() on index: 0 (by @​sarathfrancis90).

v8.5.15

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• Fixed declaration parsing performance (by @​homanp).

v8.5.14

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• Fixed custom syntax regression (by @​43081j).

v8.5.13

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• Fixed postcss-scss commend regression.

v8.5.12

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• Fixed reading any file via user-generated CSS.
• Added opts.unsafeMap to disable checks.

v8.5.11

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• Fixed nested brackets parsing performance (by @​offset).

v8.5.10

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• Fixed XSS via unescaped </style> in non-bundler cases (by @​TharVid).

v8.5.9

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• Speed up source map encoding paring in case of the error.

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