Bump autoprefixer from 9.5.1 to 9.7.3

[dependabot-preview[bot]]

Bumps autoprefixer from 9.5.1 to 9.7.3.

Release notes

*Sourced from [autoprefixer's releases](https://github.com/postcss/autoprefixer/releases).* > ## 9.7.3 > * Fix compatibility with PostCSS Modules. > > ## 9.7.2 > * Add `-ms-user-select: element` support. > * Add funding link for `npm fund`. > > ## 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. > ... (truncated)

Changelog

*Sourced from [autoprefixer's changelog](https://github.com/postcss/autoprefixer/blob/master/CHANGELOG.md).* > ## 9.7.3 > * Fix compatibility with PostCSS Modules. > > ## 9.7.2 > * Add `-ms-user-select: element` support. > * Add funding link for `npm fund`. > > ## 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

- [`4a3e207`](https://github.com/postcss/autoprefixer/commit/4a3e207af5084964d29018a1a2fc337243a11f95) Release 9.7.3 version - [`55027d7`](https://github.com/postcss/autoprefixer/commit/55027d714ef01d17fc6bb2737c85181c002ed656) Fix Node.js 6 test in CI - [`f09a928`](https://github.com/postcss/autoprefixer/commit/f09a9288dbe04631a8a69b29df08f1f029a90c23) Do not run Size Limit for Node.js 6 - [`0fa06b4`](https://github.com/postcss/autoprefixer/commit/0fa06b49d87ea48b580f2ea1001d8bed0493368d) Update dependencies - [`7f1e953`](https://github.com/postcss/autoprefixer/commit/7f1e95331b4878c134c88c20dcc591094dfe5fe7) Clean up RegExps - [`33ee989`](https://github.com/postcss/autoprefixer/commit/33ee9897b1eaa591ed3bb80bb098b29fbed5eab7) Fix compatibility with CSS Modules - [`8afc95e`](https://github.com/postcss/autoprefixer/commit/8afc95e20e3f1c8ba9a566b51676f74524ea5ffa) Fix JSDoc indent - [`31e240a`](https://github.com/postcss/autoprefixer/commit/31e240aaa9042bfb8245cdbb195fa6bc31f25453) Release 9.7.2 version - [`f34429b`](https://github.com/postcss/autoprefixer/commit/f34429bdc2233956f32aab23eec998db1de63678) Add -ms-user-select: element support - [`2f5976f`](https://github.com/postcss/autoprefixer/commit/2f5976f649ae59f2fb0d000d4c134c1494bed4c4) Downgrade Size Limit to fix Node.js 6 support on CI - Additional commits viewable in [compare view](https://github.com/postcss/autoprefixer/compare/9.5.1...9.7.3)

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[dependabot-preview[bot]]

Superseded by #258.