[plex] add UDP to plex

[onedr0p]

Special notes for your reviewer:

Credit to @schellappan https://github.com/munnerz/kube-plex/pull/105

Checklist

[Place an '[x]' (no spaces) in all applicable fields. Please remove unrelated fields.]

• [x] Chart Version bumped
• [x] Variables are documented in the README.md
• [x] Title of the PR starts with chart name (e.g. [radarr])

[billimek]

Thanks for adding this @onedr0p (and @schellappan)!