Deploy the merged active-active work (process lifecycle, Redis rate
limiter, radarr MediaCover->S3) now on each fork's main; the cluster
still runs -unkin2 so the merged code is undeployed.
- sonarr: v5.0.0-unkin2 -> v5.0.0-unkin3
- radarr: v6.4.2-unkin2 -> v6.4.2-unkin3
- prowlarr: v2.6.2-unkin2 -> v2.6.2-unkin3