Update dependency autoprefixer to v10.4.19

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
autoprefixer	10.4.18 -> 10.4.19

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Release Notes

postcss/autoprefixer (autoprefixer)

v10.4.19

Compare Source

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

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Configuration

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