[mercantour2] bios update

data/grid5000/sites/sophia/clusters/mercantour2/nodes/mercantour2-1.json

@@ -7,9 +7,9 @@
     "platform_type": "x86_64"
   },
   "bios": {
-    "release_date": "03/04/2015",
+    "release_date": "7/8/2019",
     "vendor": "Dell Inc.",
-    "version": "2.7.1"
+    "version": "2.10.0"
   },
   "bmc_version": "2.59",
   "chassis": {