Bump autoprefixer from 9.5.1 to 9.7.1

[dependabot-preview[bot]]

Bumps autoprefixer from 9.5.1 to 9.7.1.

Release notes

*Sourced from [autoprefixer's releases](https://github.com/postcss/autoprefixer/releases).* > ## 9.7.1 > * Avoid unnecessary transitions in prefixed selectors (by [@​fanich37](https://github.com/fanich37)). > * Fix `fit-content` for Firefox. > > ## 9.7 “Ad Victoriam” > > > Autoprefixer 9.7 brings `AUTOPREFIXER_GRID` environment variable and huge performance improvments. > > ## Grid Environment Variable > > Autoprefixer can add [CSS Grid polyfills for IE](https://github.com/postcss/autoprefixer#does-autoprefixer-polyfill-grid-layout-for-ie). You need to manually enable it to prove that you understand the limits of polyfill. > > In previous versions you can enable Grid polyfill by `grid: 'autoplace'` option or by `/* autoprefixer grid: autoplace */` control comment. But in some cases, developers were not able to use both methods. For instance, during [work with Material UI’ CSS-in-JS in Create React App](https://github-redirect.dependabot.com/postcss/autoprefixer/issues/1257). > > Now Autoprefixer supports environment variable to enable CSS Grid polyfill: > > ```sh > AUTOPREFIXER_GRID=autoplace npm build > ``` > > ## Performance Improvements > > [@​Knagis](https://github.com/Knagis) [found](https://github-redirect.dependabot.com/postcss/autoprefixer/issues/1256) that Browserslist takes 70% of the Autoprefixer time. > >  > > We did a lot of improvements in Browserslist and now Autoprefixer should work much faster. > >  > > ## Other > > * Fix [`Cannot read property 'grid' of undefined`](https://github-redirect.dependabot.com/postcss/autoprefixer/issues/1244) error > > ## 9.6.5 > * Fix selector prefixing (by [@​fanich37](https://github.com/fanich37)). > > ## 9.6.4 > * Now the real fix for `'startsWith' of undefined` error. > > ## 9.6.3 > * Fix `Cannot read property 'startsWith' of undefined` error. > > ## 9.6.2 > * Fix false `Replace fill to stretch` warning. > > ## 9.6.1 > * Fix `-webkit-line-clamp` truncating multi-line text support. > > ... (truncated)

Changelog

*Sourced from [autoprefixer's changelog](https://github.com/postcss/autoprefixer/blob/master/CHANGELOG.md).* > ## 9.7.1 > * Avoid unnecessary transitions in prefixed selectors (by Andrey Alexandrov). > * Fix `fit-content` for Firefox. > > ## 9.7 “Ad Victoriam” > * Add `AUTOPREFIXER_GRID` env variable to enable Grid Layout polyfill for IE. > * Fix `Cannot read property 'grid' of undefined` error. > > ## 9.6.5 > * Fix selector prefixing (by Andrey Alexandrov). > > ## 9.6.4 > * Now the real fix for `'startsWith' of undefined` error. > > ## 9.6.3 > * Fix `Cannot read property 'startsWith' of undefined` error. > > ## 9.6.2 > * Fix false `Replace fill to stretch` warning. > > ## 9.6.1 > * Fix `-webkit-line-clamp` truncating multi-line text support. > > ## 9.6 “Nunc id vides, nunc ne vides” > * Show warning about Browserslist config on `browser` option. > * Add warning-less `overrideBrowserslist` option. > * Add `text-orientation` support. > * Add `min-resolution: 2x` alias support. > * Add `.github/CONTRIBUTING.md` (by Juan Martin Marco).

Commits

- [`bf2e89e`](https://github.com/postcss/autoprefixer/commit/bf2e89eee774cd8258f096fb4ccfa1efc4fb8c69) Release 9.7.1 version - [`db0623f`](https://github.com/postcss/autoprefixer/commit/db0623f417b9ae57ce834237ba29b47f02ef19d9) Update dependencies - [`5cfde29`](https://github.com/postcss/autoprefixer/commit/5cfde2965a462b5326dbcd8d4d5b3b2253dd62fb) Feature/vendor specific transition ([#1260](https://github-redirect.dependabot.com/postcss/autoprefixer/issues/1260)) - [`400d48f`](https://github.com/postcss/autoprefixer/commit/400d48feb9e2d060d944908ac99d03cd4f0cc540) Update ESLint config - [`89d723c`](https://github.com/postcss/autoprefixer/commit/89d723c0546a59db066397dfd4fa92a812d5453d) Fix fit-content in Firefox - [`9eb27f0`](https://github.com/postcss/autoprefixer/commit/9eb27f0eeab4cfe6bac01dd12bb85a5769287a87) Revert fit-content fix - [`7869a83`](https://github.com/postcss/autoprefixer/commit/7869a83f13fd2851a099f9fdf71e3345477177b0) Fix fit-content prefix - [`f4553aa`](https://github.com/postcss/autoprefixer/commit/f4553aa0277bd5a8b5151673b9d9e83c330f75c6) Fix typo ([#1259](https://github-redirect.dependabot.com/postcss/autoprefixer/issues/1259)) - [`22871d1`](https://github.com/postcss/autoprefixer/commit/22871d1504e053708fca4215da0929be90e5ab78) Release 9.7 version - [`ed1cf68`](https://github.com/postcss/autoprefixer/commit/ed1cf687fb9deaea187d04aaf447a89ac2b55c40) Update PostCSS - Additional commits viewable in [compare view](https://github.com/postcss/autoprefixer/compare/9.5.1...9.7.1)

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Superseded by #238.