chore(helm): bump chart to 1.6.0 for the billing-cycle-close cron job

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

Author: icecrasher321

helm/sim/Chart.yaml

@@ -2,7 +2,7 @@ apiVersion: v2
 name: sim
 description: A Helm chart for Sim - the open-source AI workspace where teams build, deploy, and manage AI agents
 type: application
-version: 1.5.4
+version: 1.6.0
 appVersion: "v0.7.44"
 kubeVersion: ">=1.25.0-0"
 home: https://sim.ai