Update chiterne's warranty date

data/grid5000/sites/lille/servers/chiterne.json

@@ -23,5 +23,5 @@
   "serial": "JH5RS62",
   "type": "server",
   "uid": "chiterne",
-  "warranty": "2022-06-18"
+  "warranty": "2024-01-25"
 }
\ No newline at end of file