Update CSS preprocessors

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
autoprefixer	10.5.0 → 10.5.2
cssnano	8.0.1 → 8.0.2
postcss (source)	8.5.15 → 8.5.16

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Release Notes

postcss/autoprefixer (autoprefixer)

v10.5.2

Compare Source

• Moved -webkit-fill-available before -moz-available, so Firefox
  will use -webkit- version which is closer to stretch.

v10.5.1

Compare Source

• Fixed grid-area span reset for overriding areas (by @​puneetdixit200).

cssnano/cssnano (cssnano)

v8.0.2: v8.0.2

Compare Source

What's Changed

• perf(postcss-unique-selectors): add fast paths for the common cases by @​dkryaklin in #​1813
• perf(postcss-discard-duplicates): bucket rules by selector by @​dkryaklin in #​1815
• perf(postcss-merge-longhand): skip processors with no relevant decls by @​dkryaklin in #​1814
• Include postcss-discard-overridden types in package by @​itosa-kazu in #​1817
• fix: preserve apostrophes in svg data uris by @​pupuking723 in #​1819

Full Changelog: https://github.com/cssnano/cssnano/compare/cssnano@8.0.1...cssnano@8.0.2

postcss/postcss (postcss)

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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