graffiti-9 Update BIOS

input/grid5000/sites/nancy/clusters/graffiti/nodes/graffiti-9.yaml

@@ -8,9 +8,9 @@ graffiti-9:
     nb_threads: 32
     platform_type: x86_64
   bios:
-    release_date: 11/27/2019
+    release_date: 04/10/2020
     vendor: Dell Inc.
-    version: 2.4.8
+    version: 2.6.4
   bmc_version: 4.10.10.10
   chassis:
     manufacturer: Dell Inc.
@@ -108,7 +108,7 @@ graffiti-9:
     cache_l3: 11534336
     ht_capable: true
     instruction_set: x86-64
-    microcode: '0x2000065'
+    microcode: '0x2000069'
     model: Intel Xeon
     other_description: Intel(R) Xeon(R) Silver 4110 CPU @ 2.10GHz
     vendor: Intel