chore(deps): update dependency postcss to v8.5.12

Author: renovate[bot]

package.json

@@ -101,7 +101,7 @@
     "jest-environment-jsdom": "30.2.0",
     "lint-staged": "15.5.2",
     "npm-run-all2": "7.0.2",
-    "postcss": "8.5.6",
+    "postcss": "8.5.12",
     "postcss-preset-env": "10.5.0",
     "prettier": "3.7.4",
     "react": "19.2.3",