arrstack: bump sonarr/radarr/prowlarr images to -unkin4

Deploy the merged Redis SignalR backplane + cross-replica cache
invalidation and MediaCover/backups S3 storage work into the cluster.

- Bump sonarr app image to v5.0.0-unkin4
- Bump radarr app image to v6.4.2-unkin4
- Bump prowlarr app image to v2.6.2-unkin4

apps/base/arrstack/prowlarr/deployment.yaml

@@ -64,7 +64,7 @@ spec:
               memory: 64Mi
       containers:
         - name: prowlarr
-          image: artifactapi.k8s.syd1.au.unkin.net/docker-internal/prowlarr:v2.6.2-unkin3
+          image: artifactapi.k8s.syd1.au.unkin.net/docker-internal/prowlarr:v2.6.2-unkin4
           imagePullPolicy: IfNotPresent
           command:
             - /app/Prowlarr

apps/base/arrstack/radarr/deployment.yaml

@@ -64,7 +64,7 @@ spec:
               memory: 64Mi
       containers:
         - name: radarr
-          image: artifactapi.k8s.syd1.au.unkin.net/docker-internal/radarr:v6.4.2-unkin3
+          image: artifactapi.k8s.syd1.au.unkin.net/docker-internal/radarr:v6.4.2-unkin4
           imagePullPolicy: IfNotPresent
           command:
             - /app/Radarr

apps/base/arrstack/sonarr/deployment.yaml

@@ -64,7 +64,7 @@ spec:
               memory: 64Mi
       containers:
         - name: sonarr
-          image: artifactapi.k8s.syd1.au.unkin.net/docker-internal/sonarr:v5.0.0-unkin3
+          image: artifactapi.k8s.syd1.au.unkin.net/docker-internal/sonarr:v5.0.0-unkin4
           imagePullPolicy: IfNotPresent
           command:
             - /app/Sonarr