Update dependency autoprefixer to v10.6.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
autoprefixer	10.4.13 → 10.6.1

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Release Notes

postcss/autoprefixer (autoprefixer)

v10.6.1

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• Fixed grid gap set with the row-gap and column-gap longhands (by dualfroz).

v10.6.0

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• Added initial-letter support (by @​thomasmattheussen).

v10.5.6

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• Fixed producing wrong old -webkit- gradients (by @​ryanchou1994).

v10.5.5

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• Fixed resolution media query parsing performance (by @​NotAFlightRisk).

v10.5.4

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• Fixed prefixed rule duplication (by @​xianjianlf2).

v10.5.3

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• Fixed brackets and gradient parser (@​alanturing881).

v10.5.2

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

v10.5.1

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

v10.5.0

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• Added mask-position-x and mask-position-y support (by @​toporek).

v10.4.27

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• Removed development key from package.json.

v10.4.26

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• Reduced package size.

v10.4.25

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• Fixed broken gradients on CSS Custom Properties (by @​serger777).

v10.4.24

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• Made Autoprefixer a little faster (by @​Cherry).

v10.4.23

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• Reduced dependencies (by @​hyperz111).

v10.4.22

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• Fixed stretch prefixes on new Can I Use database.
• Updated fraction.js.

v10.4.21

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• Fixed old -moz- prefix for :placeholder-shown (by @​Marukome0743).

v10.4.20

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• Fixed fit-content prefix for Firefox.

v10.4.19

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• Removed end value has mixed support, consider using flex-end warning
  since end/start now have good support.

v10.4.18

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• Fixed removing -webkit-box-orient on -webkit-line-clamp (@​Goodwine).

v10.4.17

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• Fixed user-select: contain prefixes.

v10.4.16

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• Improved performance (by Romain Menke).
• Fixed docs (by Christian Oliff).

v10.4.15

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• Fixed ::backdrop prefixes (by 一丝).
• Fixed docs (by Christian Oliff).

v10.4.14

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• Improved startup time and reduced JS bundle size (by Kārlis Gaņģis).

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