Update RocketAdmin to 1.22.6

[github-actions]

This PR updates the RocketAdmin Helm chart to use the latest release.

Changes:

• Updated appVersion from 1.17.7 to 1.22.6
• Incremented chart version

Release Notes:
See: https://github.com/rocket-admin/rocketadmin/releases/tag/1.22.6

🤖 This PR was created automatically by the update-chart-version workflow.

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