Update dependency postcss to v8.4.48

Author: renovate[bot]

package-lock.json

@@ -26,7 +26,7 @@
     "css-loader": "7.1.2",
     "html-webpack-plugin": "5.6.0",
     "mini-css-extract-plugin": "2.9.0",
-    "postcss": "8.4.41",
+    "postcss": "8.4.48",
     "postcss-loader": "8.1.1",
     "sass": "1.77.8",
     "sass-loader": "16.0.0",