chore(deps): Bump fluxcd/helm-controller in /pkg/svc/installer/flux (#5307)

Bumps [fluxcd/helm-controller](https://github.com/fluxcd/helm-controller) from v1.5.5 to v1.6.0.
- [Release notes](https://github.com/fluxcd/helm-controller/releases)
- [Changelog](https://github.com/fluxcd/helm-controller/blob/main/CHANGELOG.md)
- [Commits](fluxcd/helm-controller@v1.5.5...v1.6.0)

---
updated-dependencies:
- dependency-name: fluxcd/helm-controller
  dependency-version: v1.6.0
  dependency-type: direct:production
...

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Author: dependabot[bot]

pkg/svc/installer/flux/Dockerfile.distribution

@@ -13,5 +13,5 @@
 
 FROM ghcr.io/fluxcd/source-controller:v1.9.0
 FROM ghcr.io/fluxcd/kustomize-controller:v1.9.0
-FROM ghcr.io/fluxcd/helm-controller:v1.5.5
+FROM ghcr.io/fluxcd/helm-controller:v1.6.0
 FROM ghcr.io/fluxcd/notification-controller:v1.9.0