dep(deps-dev): bump postcss from 8.5.3 to 8.5.6 (#78)

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package-lock.json

@@ -39,7 +39,7 @@
     "@types/react": "~19.1.8",
     "@types/react-dom": "~19.1.6",
     "geist": "~1.4.2",
-    "postcss": "~8.5.3",
+    "postcss": "~8.5.6",
     "serve": "~14.2.4",
     "tailwindcss": "^4.1.11",
     "typescript": "~5.8.3"