Bump deepmerge from 4.1.1 to 4.2.1 in /terminus-core
Bump deepmerge from 4.1.1 to 4.2.1 in /terminus-core

Bumps [deepmerge](https://github.com/TehShrike/deepmerge) from 4.1.1 to 4.2.1.
- [Release notes](https://github.com/TehShrike/deepmerge/releases)
- [Changelog](https://github.com/TehShrike/deepmerge/blob/master/changelog.md)
- [Commits](https://github.com/TehShrike/deepmerge/compare/v4.1.1...v4.2.1)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
Eugeny/terminus,Eugeny/terminus,Eugeny/terminus,Eugeny/terminus,Eugeny/terminus,Eugeny/terminus