Update dependency autoprefixer to v9.7.6 - autoclosed

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
autoprefixer	dependencies	patch	9.7.5 -> 9.7.6

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Release Notes

postcss/autoprefixer

### [`v9.7.6`](https://togithub.com/postcss/autoprefixer/blob/master/CHANGELOG.md#​976) [Compare Source](https://togithub.com/postcss/autoprefixer/compare/9.7.5...9.7.6) - Revert `-webkit-stretch` fix.

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