chore(deps): update container image lscr.io/linuxserver/rdesktop to ubuntu-icewm@5b4958a (#15669)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| lscr.io/linuxserver/rdesktop | digest | `7c707ef` -> `5b4958a` |

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charts/stable/rdesktop/values.yaml

@@ -84,7 +84,7 @@ alpineICEWMImage:
   pullPolicy: Always
 ubuntuICEWMImage:
   repository: lscr.io/linuxserver/rdesktop
-  tag: ubuntu-icewm@sha256:7c707ef2a6c0d84a04e93f77636c170100c339d4968740e2158eef31811bcd4a
+  tag: ubuntu-icewm@sha256:5b4958a74f1dc86f2ac841535a86af48eca95fdaa91897743f6aed34ae0977bc
   pullPolicy: Always
 fedoraICEWMImage:
   repository: lscr.io/linuxserver/rdesktop