Update dependency autoprefixer to v9.8.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
autoprefixer	devDependencies	minor	9.7.6 -> 9.8.0

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Release Notes

postcss/autoprefixer

### [`v9.8.0`](https://togithub.com/postcss/autoprefixer/releases/9.8.0) [Compare Source](https://togithub.com/postcss/autoprefixer/compare/9.7.6...9.8.0) Autoprefixer 9.8 brings IE support for `:placeholder-shown`. ##### Placeholder Shown [@​tkrotoff](https://togithub.com/tkrotoff) [found](https://togithub.com/postcss/autoprefixer/issues/1311) that `input:placeholder-shown` can be emulated with `input:-ms-input-placeholder`. ```css 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 ``.

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