Bump autoprefixer from 9.7.5 to 9.7.6 (#30524)

Bumps [autoprefixer](https://github.com/postcss/autoprefixer) from 9.7.5 to 9.7.6.
- [Release notes](https://github.com/postcss/autoprefixer/releases)
- [Changelog](https://github.com/postcss/autoprefixer/blob/master/CHANGELOG.md)
- [Commits](https://github.com/postcss/autoprefixer/compare/9.7.5...9.7.6)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>
Co-authored-by: XhmikosR <xhmikosr@gmail.com>

package.json

@@ -96,7 +96,7 @@
     "@babel/preset-env": "^7.9.0",
     "@rollup/plugin-commonjs": "^11.0.2",
     "@rollup/plugin-node-resolve": "^7.1.1",
-    "autoprefixer": "^9.7.5",
+    "autoprefixer": "^9.7.6",
     "bundlesize": "^0.18.0",
     "clean-css-cli": "^4.3.0",
     "cross-env": "^7.0.2",