Chore: Bump moment and moment-timezone packages

[jackw]

This PR updates the moment and moment-timezone packages to match the current versions found in Grafana core.

• moment@2.29.2 -> moment@2.29.4
• moment-timezone@0.5.34 -> moment-timezone@0.5.38

Patch bumps clock-panel plugin to 2.1.3

Built and tested against the docker dev env and all seems well...