chore(flux): update image app-template 3.5.1 → 3.7.3 (clustertool) (#33924)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [app-template](https://redirect.github.com/bjw-s/helm-charts) | minor
| `3.5.1` -> `3.7.3` |

---

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### Release Notes

<details>
<summary>bjw-s/helm-charts (app-template)</summary>

###
[`v3.7.3`](https://redirect.github.com/bjw-s/helm-charts/releases/tag/app-template-3.7.3)

[Compare
Source](https://redirect.github.com/bjw-s/helm-charts/compare/app-template-3.7.2...app-template-3.7.3)

#### Changelog:

##### Fixed

-   Fixed name suffix for HTTPRoute
-   Fixed incorrect default backendRefs values in HTTPRoute

###
[`v3.7.2`](https://redirect.github.com/bjw-s/helm-charts/releases/tag/app-template-3.7.2)

[Compare
Source](https://redirect.github.com/bjw-s/helm-charts/compare/app-template-3.7.1...app-template-3.7.2)

#### Changelog:

##### Fixed

-   The Apache 2.0 LICENSE file has been added to the chart.
-   Fixed non-deterministic selection of primary service and port.

###
[`v3.7.1`](https://redirect.github.com/bjw-s/helm-charts/releases/tag/app-template-3.7.1)

[Compare
Source](https://redirect.github.com/bjw-s/helm-charts/compare/app-template-3.7.0...app-template-3.7.1)

#### Changelog:

##### Fixed

- Values schema is now dereferenced before packaging so it no longer
relies on internet connectivity to validate the schema.

##### Changed

-   Updated library version to 3.7.1.
- [Upgrade instructions from
v2.x](https://bjw-s.github.io/helm-charts/docs/app-template/#from-2xx-to-30x)
- [Common library chart
definition](https://redirect.github.com/bjw-s/helm-charts/blob/main/charts/library/common/Chart.yaml)

###
[`v3.7.0`](https://redirect.github.com/bjw-s/helm-charts/compare/app-template-3.6.1...app-template-3.7.0)

[Compare
Source](https://redirect.github.com/bjw-s/helm-charts/compare/app-template-3.6.1...app-template-3.7.0)

###
[`v3.6.1`](https://redirect.github.com/bjw-s/helm-charts/compare/app-template-3.6.0...app-template-3.6.1)

[Compare
Source](https://redirect.github.com/bjw-s/helm-charts/compare/app-template-3.6.0...app-template-3.6.1)

###
[`v3.6.0`](https://redirect.github.com/bjw-s/helm-charts/compare/app-template-3.5.1...app-template-3.6.0)

[Compare
Source](https://redirect.github.com/bjw-s/helm-charts/compare/app-template-3.5.1...app-template-3.6.0)

</details>

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

@@ -10,7 +10,7 @@ spec:
   chart:
     spec:
       chart: app-template
-      version: 3.5.1
+      version: 3.7.3
       sourceRef:
         kind: HelmRepository
         name: bjw-s