fix(deps): update container image lscr.io/linuxserver/rdesktop to ubuntu-mate (#15137)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| lscr.io/linuxserver/rdesktop | digest | `7acd2fd` -> `e7a893c` |

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charts/stable/rdesktop/values.yaml

@@ -36,7 +36,7 @@ alpineMATEImage:
   pullPolicy: Always
 ubuntuMATEImage:
   repository: lscr.io/linuxserver/rdesktop
-  tag: ubuntu-mate@sha256:7acd2fd33e9bb429189ed2d1b03fa2a1f0cbd4775085332e724552e9453b913f
+  tag: ubuntu-mate@sha256:e7a893c79226b7ccc0cc63fe91f9c74bdeae8cd65d4e5d6ebe22673236c7321d
   pullPolicy: Always
 fedoraMATEImage:
   repository: lscr.io/linuxserver/rdesktop