chore(deps): update dependency postcss to v8.5.19

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
postcss (source)	8.5.15 → 8.5.19

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Release Notes

postcss/postcss (postcss)

v8.5.19

Compare Source

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

v8.5.18

Compare Source

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

v8.5.17

Compare Source

• 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

Compare Source

• 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).

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