meta: bump autoprefixer from 10.4.16 to 10.4.18 (nodejs#6378)

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] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

package.json

@@ -57,7 +57,7 @@
     "@vcarl/remark-headings": "~0.1.0",
     "@vercel/analytics": "~1.2.2",
     "@vercel/speed-insights": "~1.0.10",
-    "autoprefixer": "~10.4.16",
+    "autoprefixer": "~10.4.18",
     "classnames": "~2.5.1",
     "cross-env": "7.0.3",
     "dedent": "1.5.1",