Bump postcss to version 8.4.31

Author: martedesco

package-lock.json

@@ -11,6 +11,7 @@
     "axios": "^1.6.2",
     "chart.js": "^4.4.1",
     "core-js": "^3.8.3",
+    "postcss": "^8.4.31",
     "vue": "^3.2.13",
     "vue-chartjs": "^5.3.0"
   },