[grvingt-64] Update Bios and idrac firmware version

data/grid5000/sites/nancy/clusters/grvingt/nodes/grvingt-64.json

@@ -7,11 +7,11 @@
     "platform_type": "x86_64"
   },
   "bios": {
-    "release_date": "11/27/2019",
+    "release_date": "05/06/2020",
     "vendor": "Dell Inc.",
-    "version": "2.4.8"
+    "version": "2.7.7"
   },
-  "bmc_version": "4.00.00.00",
+  "bmc_version": "4.20.20.20",
   "chassis": {
     "manufacturer": "Dell Inc.",
     "name": "PowerEdge C6420",

input/grid5000/sites/nancy/clusters/grvingt/nodes/grvingt-64.yaml

@@ -8,10 +8,10 @@ grvingt-64:
     nb_threads: 64
     platform_type: x86_64
   bios:
-    release_date: 11/27/2019
+    release_date: 05/06/2020
     vendor: Dell Inc.
-    version: 2.4.8
-  bmc_version: 4.00.00.00
+    version: 2.7.7
+  bmc_version: 4.20.20.20
   chassis:
     manufacturer: Dell Inc.
     name: PowerEdge C6420