chore(deps): bump gulp-autoprefixer from 8.0.0 to 9.0.0

Bumps [gulp-autoprefixer](https://github.com/sindresorhus/gulp-autoprefixer) from 8.0.0 to 9.0.0.
- [Release notes](https://github.com/sindresorhus/gulp-autoprefixer/releases)
- [Commits](sindresorhus/gulp-autoprefixer@v8.0.0...v9.0.0)

---
updated-dependencies:
- dependency-name: gulp-autoprefixer
  dependency-version: 9.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

package-lock.json

@@ -29,7 +29,7 @@
     "@neos21/bootstrap3-glyphicons": "^1.0.7",
     "@popperjs/core": "^2.11.8",
     "bootstrap": "^5.3.6",
-    "gulp-autoprefixer": "^8.0.0",
+    "gulp-autoprefixer": "^9.0.0",
     "gulp-cssnano": "^2.1.3",
     "gulp-header": "^2.0.9",
     "gulp-rename": "^2.0.0",