[luxembourg][vianden] Fix missing exotic attribute

data/grid5000/sites/luxembourg/clusters/vianden/nodes/vianden-1.json

@@ -19,7 +19,7 @@
     "serial": "4VLJM44",
     "warranty_end": "2028-07-15"
   },
-  "exotic": false,
+  "exotic": true,
   "gpu_devices": {
     "card0": {
       "cores": 19456,

data/grid5000/sites/luxembourg/clusters/vianden/vianden.json

 {
   "boot_type": "uefi",
   "created_at": "Mon, 06 Jan 2025 00:00:00 GMT",
-  "exotic": false,
+  "exotic": true,
   "kavlan": true,
   "manufactured_at": "2024-07-14",
   "metrics": [

input/grid5000/sites/luxembourg/clusters/vianden/vianden.yaml

@@ -3,7 +3,7 @@ model: Dell PowerEdge XE9680
 created_at: 2025-01-06
 kavlan: true
 boot_type: uefi
-exotic: false # TODO: specify if 'true' or 'false'
+exotic: true
 queues:
   - admin
   - default