Update dependency postcss to v8.5.6 (#944)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

packages/ui/package.json

@@ -64,7 +64,7 @@
     "@types/tinycolor2": "1.4.6",
     "@vitejs/plugin-react": "3.1.0",
     "autoprefixer": "10.4.21",
-    "postcss": "8.5.5",
+    "postcss": "8.5.6",
     "postcss-cli": "11.0.1",
     "postcss-import": "15.1.0",
     "prop-types": "15.8.1",