Bump webpack-merge from 5.0.9 to 5.1.1

Bumps [webpack-merge](https://github.com/survivejs/webpack-merge) from 5.0.9 to 5.1.1.
- [Release notes](https://github.com/survivejs/webpack-merge/releases)
- [Changelog](https://github.com/survivejs/webpack-merge/blob/master/CHANGELOG.md)
- [Commits](survivejs/webpack-merge@v5.0.9...v5.1.1)

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

Author: dependabot-preview[bot]

package-lock.json

@@ -124,7 +124,7 @@
     "vue-template-compiler": "^2.6.11",
     "webpack": "^4.44.1",
     "webpack-cli": "^3.3.12",
-    "webpack-merge": "^5.0.9",
+    "webpack-merge": "^5.1.1",
     "webpack-node-externals": "^2.5.0"
   },
   "browserslist": [