Auto-upgrade cronjob: switch from daily to hourly schedule

[saadqbal]

Context

The auto-upgrade CronJob (introduced in #69) currently runs once daily at 02:23 UTC. Customers freeze on whatever version they had at install time until the next 02:23 tick — up to ~24h of drift after a chart release.

Change

Switch the default schedule in client/values.yaml from "23 2 * * *" to "23 * * * *" so deployed clients converge on the latest chart within ~1h instead of ~24h.

Rollout

Two PRs, same single-line change:

• One into develop so the dev integration branch keeps in sync.
• One cherry-picked onto a branch off main so prod gets only this change without pulling every other unshipped dev commit along with it.

Acceptance criteria

• client/values.yaml autoUpgrade.schedule is "23 * * * *" on both develop and main.
• Existing auto_upgrade_test.yaml continues to pass.
• Comment above the schedule key reflects the new cadence.