chore(deps): update container image lscr.io/linuxserver/rdesktop to ubuntu-openbox@c57b073 (#15670)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| lscr.io/linuxserver/rdesktop | digest | `27f4c79` -> `c57b073` |

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charts/stable/rdesktop/values.yaml

@@ -68,7 +68,7 @@ alpineOpenBoxImage:
   pullPolicy: Always
 ubuntuOpenBoxImage:
   repository: lscr.io/linuxserver/rdesktop
-  tag: ubuntu-openbox@sha256:27f4c797a36d3cf8dffffca76f3a03437d68b478aef42d0e9f51f6df5e58fab0
+  tag: ubuntu-openbox@sha256:c57b073afe9404f67ba70dba31e34ab537bb9c56d53fdeaebf11c14d6c77c7f8
   pullPolicy: Always
 fedoraOpenBoxImage:
   repository: lscr.io/linuxserver/rdesktop