Bump @mitre/emass_client from 3.10.1 to 3.12.0

Bumps [@mitre/emass_client](https://github.com/mitre/emass_client) from 3.10.1 to 3.12.0.
- [Release notes](https://github.com/mitre/emass_client/releases)
- [Commits](mitre/emass_client@3.10.1...3.12.0)

---
updated-dependencies:
- dependency-name: "@mitre/emass_client"
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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