Update Helm release external-dns to v1.18.0

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [volsync](https://volsync.readthedocs.io/) ([source](https://github.com/backube/volsync)) | minor | `0.12.1` -> `0.13.0` |

---

### Release Notes

<details>
<summary>backube/volsync (volsync)</summary>

### [`v0.13.0`](https://github.com/backube/volsync/releases/tag/v0.13.0)

[Compare Source](https://github.com/backube/volsync/compare/v0.12.1...v0.13.0)

##### Changed

- Multi-arch volsync image published in quay.io, will include amd64 as usual as well as arm64
- Restic updated to v0.18.0
- Syncthing updated to v1.29.7

##### Fixed

- Fix restic cache PVC name collision if replicationsource and
  replicationdestination have the same name and are in the same
  namespace

##### Security

- kube-rbac-proxy upgraded to v0.19.2

</details>

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---

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---

This PR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate).
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Reviewed-on: #946
Co-authored-by: Renovate Bot <renovate-bot@alexlebens.net>
Co-committed-by: Renovate Bot <renovate-bot@alexlebens.net>

clusters/cl01tl/services/external-dns/Chart.yaml

@@ -16,7 +16,7 @@ maintainers:
 dependencies:
   - name: external-dns
     alias: external-dns-unifi
-    version: 1.17.0
+    version: 1.18.0
     repository: https://kubernetes-sigs.github.io/external-dns/
 icon: https://cdn.jsdelivr.net/gh/selfhst/icons/png/kubernetes.png
 appVersion: 1.16.1

clusters/cl01tl/storage/volsync/Chart.yaml

@@ -16,7 +16,7 @@ maintainers:
   - name: alexlebens
 dependencies:
   - name: volsync
-    version: 0.12.1
+    version: 0.13.0
     repository: https://backube.github.io/helm-charts/
 icon: https://raw.githubusercontent.com/backube/volsync/main/docs/media/volsync.svg?sanitize=true
 appVersion: 0.12.1