chore(devdeps): update dependency postcss to v8.5.9 (#6327)

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

Author: renovate[bot]

package.json

@@ -103,7 +103,7 @@
     "oxfmt": "0.42.0",
     "oxlint": "1.57.0",
     "oxlint-tsgolint": "0.17.4",
-    "postcss": "8.5.8",
+    "postcss": "8.5.9",
     "publint": "0.3.18",
     "react": "19.2.5",
     "react-dom": "19.2.5",