chore(flux): update image docker.io/rancher/system-upgrade-controller v0.15.0 → v0.15.1 (clustertool) (#32896)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
|
[docker.io/rancher/system-upgrade-controller](https://redirect.github.com/rancher/system-upgrade-controller)
| patch | `v0.15.0` -> `v0.15.1` |

---

### Release Notes

<details>
<summary>rancher/system-upgrade-controller
(docker.io/rancher/system-upgrade-controller)</summary>

###
[`v0.15.1`](https://redirect.github.com/rancher/system-upgrade-controller/releases/tag/v0.15.1)

[Compare
Source](https://redirect.github.com/rancher/system-upgrade-controller/compare/v0.15.0...v0.15.1)

#### What's Changed

- feat: add `org.opencontainers.image.source` docker label by
[@&#8203;viceice](https://redirect.github.com/viceice) in
[https://github.com/rancher/system-upgrade-controller/pull/350](https://redirect.github.com/rancher/system-upgrade-controller/pull/350)
- Make IgnoreUpdate secrets optional by
[@&#8203;brandond](https://redirect.github.com/brandond) in
[https://github.com/rancher/system-upgrade-controller/pull/351](https://redirect.github.com/rancher/system-upgrade-controller/pull/351)

#### New Contributors

- [@&#8203;viceice](https://redirect.github.com/viceice) made their
first contribution in
[https://github.com/rancher/system-upgrade-controller/pull/350](https://redirect.github.com/rancher/system-upgrade-controller/pull/350)

**Full Changelog**:
https://github.com/rancher/system-upgrade-controller/compare/v0.15.0...v0.15.1

</details>

---

### Configuration

📅 **Schedule**: Branch creation - At any time (no schedule defined),
Automerge - At any time (no schedule defined).

🚦 **Automerge**: Enabled.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the
rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update
again.

---

- [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check
this box

---

This PR has been generated by [Renovate
Bot](https://redirect.github.com/renovatebot/renovate).

<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzOS4xODUuMSIsInVwZGF0ZWRJblZlciI6IjM5LjE4NS4xIiwidGFyZ2V0QnJhbmNoIjoibWFzdGVyIiwibGFiZWxzIjpbImF1dG9tZXJnZSIsInJlbm92YXRlL2NvbnRhaW5lciIsInR5cGUvcGF0Y2giXX0=-->

clustertool/embed/generic/kubernetes/system/system-upgrade-controller/app/helm-release.yaml

@@ -31,7 +31,7 @@ spec:
           app:
             image:
               repository: docker.io/rancher/system-upgrade-controller
-              tag: v0.15.0@sha256:6eabb80da751aca53f8f0628f36ac15e9d17f241d56b64efc209a4909084f573
+              tag: v0.15.1@sha256:365ba1a4af94a330466df87388271ddb3d324b2f9385cde6b4d1d39f39174639
             env:
               SYSTEM_UPGRADE_CONTROLLER_DEBUG: false
               SYSTEM_UPGRADE_CONTROLLER_THREADS: 2