[Security] Bump merge from 1.2.0 to 1.2.1 (ember-cli#60)

Bumps [merge](https://github.com/yeikos/js.merge) from 1.2.0 to 1.2.1. **This update includes security fixes.**
- [Release notes](https://github.com/yeikos/js.merge/releases)
- [Commits](swordev/merge@v1.2.0...v1.2.1)

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

Author: dependabot[bot]

yarn.lock

@@ -3816,8 +3816,8 @@ merge-trees@^2.0.0:
     heimdalljs "^0.2.5"
 
 merge@^1.1.3:
-  version "1.2.0"
-  resolved "https://registry.yarnpkg.com/merge/-/merge-1.2.0.tgz#7531e39d4949c281a66b8c5a6e0265e8b05894da"
+  version "1.2.1"
+  resolved "https://registry.yarnpkg.com/merge/-/merge-1.2.1.tgz#38bebf80c3220a8a487b6fcfb3941bb11720c145"
 
 methods@~1.1.2:
   version "1.1.2"