Update Helm release app-template to v4.5.0 (#2270)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [app-template](https://github.com/bjw-s-labs/helm-charts) | minor | `4.4.0` -> `4.5.0` |

---

### Release Notes

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

### [`v4.5.0`](https://github.com/bjw-s-labs/helm-charts/releases/tag/app-template-4.5.0)

[Compare Source](https://github.com/bjw-s-labs/helm-charts/compare/app-template-4.4.0...app-template-4.5.0)

##### Changelog:

##### Changed

- Upgraded the common library to v4.5.0
  - [Upgrade notes](https://bjw-s-labs.github.io/helm-charts/docs/app-template/upgrade-instructions/)
  - [Detailed release notes](https://github.com/bjw-s-labs/helm-charts/releases/tag/common-4.5.0)

</details>

---

### Configuration

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🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

♻ **Rebasing**: Whenever PR is behind base branch, 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://github.com/renovatebot/renovate).
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Reviewed-on: #2270
Co-authored-by: Renovate Bot <renovate-bot@alexlebens.net>
Co-committed-by: Renovate Bot <renovate-bot@alexlebens.net>

clusters/cl01tl/helm/matrix-synapse/Chart.lock

@@ -4,7 +4,7 @@ dependencies:
   version: 3.12.16
 - name: app-template
   repository: https://bjw-s-labs.github.io/helm-charts/
-  version: 4.4.0
+  version: 4.5.0
 - name: cloudflared
   repository: oci://harbor.alexlebens.net/helm-charts
   version: 1.23.1
@@ -14,5 +14,5 @@ dependencies:
 - name: postgres-cluster
   repository: oci://harbor.alexlebens.net/helm-charts
   version: 6.16.1
-digest: sha256:1bf6e5f4693930d4f0ee8753eae5afee055894f01ddbefbae969bf834c8cad99
-generated: "2025-12-04T00:02:43.058364936Z"
+digest: sha256:8a50907ebe63a29d2219d824391e0cd1ed76e80adc234d0bc4dd48414cc24a83
+generated: "2025-12-05T17:08:37.566169937Z"