[Security] Bump merge from 1.2.0 to 1.2.1

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>