Update Flux

This MR contains the following updates:

Package	Update	Change
registry1.dso.mil/ironbank/fluxcd/helm-controller (source)	minor	v1.2.0 -> v1.3.0
registry1.dso.mil/ironbank/fluxcd/kustomize-controller (source)	minor	v1.5.1 -> v1.6.0
registry1.dso.mil/ironbank/fluxcd/notification-controller (source)	minor	v1.5.0 -> v1.6.0
registry1.dso.mil/ironbank/fluxcd/source-controller (source)	minor	v1.5.0 -> v1.6.0

Complete MR checklist

Assignee

• Followed upgrade instructions outlined in docs/DEVELOPMENT_MAINTENANCE.md
• Update Docs with new/updated steps as needed
• Tested and Validated Changes made with supporting info like logs or screenshots from test pipelines

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Reviewer only

• Tested and Validated changes

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Configuration

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This MR was automatically generated by Renovate Bot.

Upgrade Notices

Flux upgrade. Update your local Flux binary to v2.6.1 and update your flux controllers.

• Helm Controller updated from v1.2.0 -> v1.3.0
• Source Controller updated from v1.5.0 -> v1.6.0
• Kustomize Controller updated from v1.5.1 -> v1.6.0
• Notification Controller updated from v1.5.0 -> v1.6.0