Bump autoprefixer from 10.4.19 to 10.4.20 in /frontend (#3943)

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

Author: dependabot[bot]

frontend/package.json

@@ -76,7 +76,7 @@
 		"@types/react-dom": "^18.3.0",
 		"@types/testing-library__jest-dom": "^5.14.1",
 		"@xstate/inspect": "^0.8.0",
-		"autoprefixer": "^10.4.13",
+		"autoprefixer": "^10.4.20",
 		"jest": "^29.7.0",
 		"postcss": "^8.4.35",
 		"tailwindcss": "^3.3.5",