Bump autoprefixer from 10.4.17 to 10.4.18 (#3820)

Bumps [autoprefixer](https://github.com/postcss/autoprefixer) from 10.4.17 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@10.4.17...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>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

package.json

@@ -22,7 +22,7 @@
     "@11ty/eleventy": "^2.0.1",
     "@11ty/eleventy-img": "^3.1.8",
     "@uswds/uswds": "^3.7.1",
-    "autoprefixer": "^10.4.17",
+    "autoprefixer": "^10.4.18",
     "eleventy-plugin-svg-sprite": "^2.4.2",
     "esbuild": "^0.19.12",
     "esbuild-sass-plugin": "^2.16.1",