Bump webpack-merge from 5.7.2 to 5.7.3 (#909)

Bumps [webpack-merge](https://github.com/survivejs/webpack-merge) from 5.7.2 to 5.7.3.
- [Release notes](https://github.com/survivejs/webpack-merge/releases)
- [Changelog](https://github.com/survivejs/webpack-merge/blob/develop/CHANGELOG.md)
- [Commits](survivejs/webpack-merge@v5.7.2...v5.7.3)

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package.json

@@ -19,6 +19,6 @@
     "typescript": "4.1.3",
     "webpack": "5.11.0",
     "webpack-cli": "4.3.0",
-    "webpack-merge": "5.7.2"
+    "webpack-merge": "5.7.3"
   }
 }