security/teleport: update to 4.2.9

ChangeLog: https://github.com/gravitational/teleport/releases/tag/v4.2.9

• Fixed an issue where double tsh login would be required to login to a leaf cluster. #3639
• Fixed an issue that was preventing connection reuse. #3613
• Fixed an issue that could cause tsh ls to return stale results. #3536

Reported by: portscout