Chore: Update autoprefixer to v10.4.20 [skip netlify]

[renovate]

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

Compare Source

• Fixed fit-content prefix for Firefox.

v10.4.19

Compare Source

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

v10.4.18

Compare Source

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

v10.4.17

Compare Source

• Fixed user-select: contain prefixes.

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