chore(deps): update dependency autoprefixer to v10.6.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
autoprefixer	10.5.0 → 10.6.0

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Release Notes

postcss/autoprefixer (autoprefixer)

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).

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