Update dependency autoprefixer to v10.6.0

This MR contains the following updates:

Package	Change	Age	Confidence
autoprefixer	10.5.3 → 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

Compare Source

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

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