Update dependency postcss to v8.4.47

Author: renovate[bot]

package-lock.json

@@ -22,7 +22,7 @@
     "css-loader": "7.1.2",
     "html-webpack-plugin": "5.6.0",
     "mini-css-extract-plugin": "2.9.1",
-    "postcss": "8.4.45",
+    "postcss": "8.4.47",
     "postcss-loader": "8.1.1",
     "sass": "1.78.0",
     "sass-loader": "16.0.1",