fix(deps): update dependency postcss to v8.5.6

Author: renovate[bot]

package-lock.json

@@ -81,7 +81,7 @@
     "jest-environment-jsdom": "29.7.0",
     "mini-css-extract-plugin": "1.6.2",
     "parse5": "7.1.2",
-    "postcss": "8.4.49",
+    "postcss": "8.5.6",
     "postcss-custom-media": "10.0.8",
     "postcss-loader": "7.3.4",
     "postcss-rtlcss": "5.1.2",