Updating maintainer email to remove beta since Workstation is going GA

[tyler-ball]

Description

[Please describe what this change achieves]

Issues Resolved

[List any existing issues this PR resolves, or any Discourse or StackOverflow discussion that's relevant]

Check List

• [ ] ~New functionality includes tests~
• [ ] ~All tests pass~
• [x] PR title is a worthy inclusion in the CHANGELOG
• [ ] You have locally validated the change

Signed-off-by: tyler-ball tball@chef.io