Update dependency autoprefixer to v10.4.20

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
autoprefixer	10.4.16 -> 10.4.20

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Release Notes

postcss/autoprefixer (autoprefixer)

### [`v10.4.20`](https://redirect.github.com/postcss/autoprefixer/blob/HEAD/CHANGELOG.md#10420) [Compare Source](https://redirect.github.com/postcss/autoprefixer/compare/10.4.19...10.4.20) - Fixed `fit-content` prefix for Firefox. ### [`v10.4.19`](https://redirect.github.com/postcss/autoprefixer/blob/HEAD/CHANGELOG.md#10419) [Compare Source](https://redirect.github.com/postcss/autoprefixer/compare/10.4.18...10.4.19) - Removed `end value has mixed support, consider using flex-end` warning since `end`/`start` now have good support. ### [`v10.4.18`](https://redirect.github.com/postcss/autoprefixer/blob/HEAD/CHANGELOG.md#10418) [Compare Source](https://redirect.github.com/postcss/autoprefixer/compare/10.4.17...10.4.18) - Fixed removing `-webkit-box-orient` on `-webkit-line-clamp` ([@​Goodwine](https://redirect.github.com/Goodwine)). ### [`v10.4.17`](https://redirect.github.com/postcss/autoprefixer/blob/HEAD/CHANGELOG.md#10417) [Compare Source](https://redirect.github.com/postcss/autoprefixer/compare/10.4.16...10.4.17) - Fixed `user-select: contain` prefixes.

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Configuration

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