Bump webpack-merge from 5.8.0 to 5.9.0 (#25084)

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package.json

@@ -128,7 +128,7 @@
     "webpack-assets-manifest": "^4.0.6",
     "webpack-bundle-analyzer": "^4.8.0",
     "webpack-cli": "^3.3.12",
-    "webpack-merge": "^5.8.0",
+    "webpack-merge": "^5.9.0",
     "wicg-inert": "^3.1.2",
     "workbox-expiration": "^6.5.4",
     "workbox-precaching": "^6.5.4",