Fix NetBox Helm values to use correct Redis config keys

externalRedis is not a valid chart value — the correct keys are tasksRedis
and cachingRedis. Pointing both at the shared redis-master in db-redis.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: sfroeber

argocd/apps/platform/netbox.yml

@@ -48,7 +48,13 @@ spec:
           existingSecretKey: password
 
         # External Redis configuration
-        externalRedis:
+        tasksRedis:
+          host: redis-master.db-redis.svc.cluster.local
+          port: 6379
+          existingSecretName: netbox-redis-credentials
+          existingSecretKey: password
+
+        cachingRedis:
           host: redis-master.db-redis.svc.cluster.local
           port: 6379
           existingSecretName: netbox-redis-credentials