Update dependency postcss-loader to v7.3.2

Author: renovate[bot]

package-lock.json

@@ -21,7 +21,7 @@
     "html-webpack-plugin": "5.5.1",
     "mini-css-extract-plugin": "2.7.6",
     "postcss": "8.4.23",
-    "postcss-loader": "7.3.1",
+    "postcss-loader": "7.3.2",
     "sass": "1.62.1",
     "sass-loader": "13.3.0",
     "style-loader": "3.3.3",