Bump webpack-merge from 4.1.5 to 4.2.1

Bumps [webpack-merge](https://github.com/survivejs/webpack-merge) from 4.1.5 to 4.2.1.
- [Release notes](https://github.com/survivejs/webpack-merge/releases)
- [Changelog](https://github.com/survivejs/webpack-merge/blob/master/CHANGELOG.md)
- [Commits](https://github.com/survivejs/webpack-merge/compare/v4.1.5...v4.2.1)

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

package-lock.json

@@ -13273,9 +13273,9 @@
 			}
 		},
 		"webpack-merge": {
-			"version": "4.1.5",
-			"resolved": "https://registry.npmjs.org/webpack-merge/-/webpack-merge-4.1.5.tgz",
-			"integrity": "sha512-sVcM+MMJv6DO0C0GLLltx8mUlGMKXE0zBsuMqZ9jz2X9gsekALw6Rs0cAfTWc97VuWS6NpVUa78959zANnMMLQ==",
+			"version": "4.2.1",
+			"resolved": "https://registry.npmjs.org/webpack-merge/-/webpack-merge-4.2.1.tgz",
+			"integrity": "sha512-4p8WQyS98bUJcCvFMbdGZyZmsKuWjWVnVHnAS3FFg0HDaRVrPbkivx2RYCre8UiemD67RsiFFLfn4JhLAin8Vw==",
 			"dev": true,
 			"requires": {
 				"lodash": "^4.17.5"

package.json

@@ -88,7 +88,7 @@
 		"vue-template-compiler": "^2.5.21",
 		"webpack": "^4.28.3",
 		"webpack-cli": "^3.2.0",
-		"webpack-merge": "^4.1.5"
+		"webpack-merge": "^4.2.1"
 	},
 	"jest": {
 		"moduleFileExtensions": [