Update deployment-operator chart to 0.6.67

[plural-copilot]

Update deployment-operator chart to 0.6.67

Plural Service: mgmt/apps

[greptile-apps]

Confidence Score: 5/5

The PR appears safe to merge because the chart and application version metadata are updated consistently.

Summary

Updates the deployment-operator Helm chart release metadata from 0.6.66 to 0.6.67.

• Keeps version and appVersion aligned.
• Advances the default operator and agentk image tags through the existing appVersion coupling.

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