Bump autoprefixer from 10.4.14 to 10.4.15 (#3690)

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: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

@@ -22,7 +22,7 @@
     "@11ty/eleventy": "^2.0.1",
     "@11ty/eleventy-img": "^3.1.0",
     "@uswds/uswds": "^3.2.0",
-    "autoprefixer": "^10.4.2",
+    "autoprefixer": "^10.4.15",
     "eleventy-plugin-svg-sprite": "^2.4.0",
     "esbuild": "^0.18.19",
     "esbuild-sass-plugin": "^2.11.0",