Bump autoprefixer from 10.4.16 to 10.4.18

Bumps [autoprefixer](https://github.com/postcss/autoprefixer) from 10.4.16 to 10.4.18.
- [Release notes](https://github.com/postcss/autoprefixer/releases)
- [Changelog](https://github.com/postcss/autoprefixer/blob/main/CHANGELOG.md)
- [Commits](postcss/autoprefixer@10.4.16...10.4.18)

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

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

package.json

@@ -5,7 +5,7 @@
     "@babel/plugin-proposal-private-methods": "^7.18.6",
     "@babel/plugin-proposal-private-property-in-object": "^7.21.11",
     "@rails/ujs": "^7.1.2",
-    "autoprefixer": "^10.4.16",
+    "autoprefixer": "^10.4.18",
     "chart.js": "^4.4.0",
     "chartkick": "^5.0.1",
     "postcss": "^8.4.31",