Update deployment-operator chart to 0.6.64

[plural-copilot]

Update deployment-operator chart to 0.6.64

Plural Service: mgmt/apps

[greptile-apps]

Confidence Score: 5/5

The PR appears safe to merge; no actionable defects were identified.

Summary

• Changes the default application image tag through the chart’s existing appVersion fallback.
• Keeps chart and application versions aligned; no actionable issues identified.

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