Update dependency autoprefixer to v9.8.8

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
autoprefixer	9.7.3 -> 9.8.8

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Release Notes

postcss/autoprefixer

v9.8.8

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• Replaced nanocolors with picocolors.
• Reduced package size.

v9.8.7

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• Replaced colorette with nanocolors.
• Reduced package size.

v9.8.6

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• Fixed env option.

v9.8.5

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• Improved Grid Layout warnings (by Daniel Tonon).
• Fixed align-self and justify-self with display: flex (by Daniel Tonon).

v9.8.4

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• Replace color output library.

v9.8.3

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• Return old non-LTS Node.js versions to avoid breaking changes.

v9.8.2

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• Remove Node.js 13.0-13.7 from supported engines, because of buggy ESM support.

v9.8.1

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• Replace chalk to kleur (by Luke Edwards).
• Update docs (by @​mbomb007).

v9.8.0

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Autoprefixer 9.8 brings IE support for :placeholder-shown.

Placeholder Shown

@​tkrotoff found that input:placeholder-shown can be emulated with input:-ms-input-placeholder.

input:-ms-input-placeholder {
  box-shadow: 0 0 0 1px blue;
}

input:placeholder-shown {
  box-shadow: 0 0 0 1px blue;
}

Note, that we already had support for ::placeholder. Selector ::placeholder is for the text of the placeholder. :placeholder-shown is for the input, where placeholder text is shown. In ::placeholder you can’t change the border or size of the <input>.

v9.7.6

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• Revert -webkit-stretch fix.

v9.7.5

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• Fix -webkit-stretch support.

v9.7.4

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• Fix warning text (by Dmitry Ishkov).

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