[nancy] servers - migrate srv3 to pve-3 (proxmox)

Migration de srv3.nancy en proxmox (srv3)

data/grid5000/sites/nancy/servers/pve-3.json

@@ -29,6 +29,6 @@
   "redfish": true,
   "serial": "FKHBSY2",
   "type": "server",
-  "uid": "srv3",
+  "uid": "pve-3",
   "warranty": "2026-07-29"
 }
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