chore(deps): update container image lscr.io/linuxserver/rdesktop to arch-openbox@c20f359 (#15335)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| lscr.io/linuxserver/rdesktop | digest | `2423a68` -> `c20f359` |

---

> [!WARNING]
> Some dependencies could not be looked up. Check the Dependency
Dashboard for more information.

---

### 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://togithub.com/renovatebot/renovate).

<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzNy42OC4wIiwidXBkYXRlZEluVmVyIjoiMzcuNjguMCIsInRhcmdldEJyYW5jaCI6Im1hc3RlciJ9-->

charts/stable/rdesktop/values.yaml

@@ -76,7 +76,7 @@ fedoraOpenBoxImage:
   pullPolicy: Always
 archOpenBoxImage:
   repository: lscr.io/linuxserver/rdesktop
-  tag: arch-openbox@sha256:2423a6839ffad3ae212dc9b57b9280dc5d15532b79520d2ca3b4ad24d08f17cd
+  tag: arch-openbox@sha256:c20f3597c9c9ac9196ab02bc7bb41d4f38eab4199dea3d29264ec76b7d16d085
   pullPolicy: Always
 alpineICEWMImage:
   repository: lscr.io/linuxserver/rdesktop