Bump autoprefixer from 10.4.14 to 10.4.15

Bumps [autoprefixer](https://github.com/postcss/autoprefixer) from 10.4.14 to 10.4.15.
- [Release notes](https://github.com/postcss/autoprefixer/releases)
- [Changelog](https://github.com/postcss/autoprefixer/blob/main/CHANGELOG.md)
- [Commits](postcss/autoprefixer@10.4.14...10.4.15)

---
updated-dependencies:
- dependency-name: autoprefixer
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

package.json

@@ -10,7 +10,7 @@
     "@popperjs/core": "2.11.8"
   },
   "devDependencies": {
-    "autoprefixer": "10.4.14",
+    "autoprefixer": "10.4.15",
     "cross-env": "7.0.3",
     "rtlcss": "4.1.0",
     "node-sass": "9.0.0",