Bump webpack-merge from 5.6.1 to 5.7.2

Bumps [webpack-merge](https://github.com/survivejs/webpack-merge) from 5.6.1 to 5.7.2.
- [Release notes](https://github.com/survivejs/webpack-merge/releases)
- [Changelog](https://github.com/survivejs/webpack-merge/blob/develop/CHANGELOG.md)
- [Commits](survivejs/webpack-merge@v5.6.1...v5.7.2)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

package.json

@@ -127,7 +127,7 @@
     "vue-template-compiler": "^2.6.12",
     "webpack": "^4.44.2",
     "webpack-cli": "^4.2.0",
-    "webpack-merge": "^5.6.1",
+    "webpack-merge": "^5.7.2",
     "webpack-node-externals": "^2.5.2"
   },
   "browserslist": [