chore(deps): update dependency postcss to v8.4.31

Author: renovate[bot]

package.json

@@ -70,7 +70,7 @@
     "is-ci": "3.0.1",
     "lint-staged": "14.0.1",
     "npm-run-all": "4.1.5",
-    "postcss": "8.4.30",
+    "postcss": "8.4.31",
     "prettier": "^3.0.0",
     "secretlint": "7.0.7",
     "sort-package-json": "2.5.1",