build(deps-dev): bump autoprefixer from 10.4.19 to 10.4.20 in /frontend

Bumps [autoprefixer](https://github.com/postcss/autoprefixer) from 10.4.19 to 10.4.20.
- [Release notes](https://github.com/postcss/autoprefixer/releases)
- [Changelog](https://github.com/postcss/autoprefixer/blob/main/CHANGELOG.md)
- [Commits](postcss/autoprefixer@10.4.19...10.4.20)

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

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

Author: dependabot[bot]

frontend/package-lock.json

@@ -64,7 +64,7 @@
     "@types/swagger-ui-react": "^4.18.3",
     "@vitejs/plugin-react": "^4.3.1",
     "@vitest/coverage-v8": "^2.0.5",
-    "autoprefixer": "^10.4.19",
+    "autoprefixer": "^10.4.20",
     "browserslist-to-esbuild": "^2.1.1",
     "eslint": "^8.57.0",
     "eslint-config-prettier": "^9.1.0",