Update dependency autoprefixer to v9.7.1

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
autoprefixer	devDependencies	patch	9.7.0 -> 9.7.1

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Release Notes

postcss/autoprefixer

### [`v9.7.1`](https://togithub.com/postcss/autoprefixer/blob/master/CHANGELOG.md#​971) [Compare Source](https://togithub.com/postcss/autoprefixer/compare/9.7.0...9.7.1) - Avoid unnecessary transitions in prefixed selectors (by Andrey Alexandrov). - Fix `fit-content` for Firefox.

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