Bump stackhpc.drac role

This new version fixes the evaluation of check_mode, which is causing
`kayobe overcloud bios raid configure` to fail.

Change-Id: I9c6e261dbac067ca3f9218e6ea81813ddc2f6520

releasenotes/notes/stackhpc-drac-check-mode-8097215f8eca9991.yaml

+---
+fixes:
+  - |
+    Fixes failures to run ``kayobe overcloud bios raid configure`` by upgrading
+    the ``stackhpc.drac`` role to version 1.1.6.

requirements.yml

@@ -26,7 +26,7 @@ roles:
   - src: stackhpc.dell-powerconnect-switch
     version: v1.1.0
   - src: stackhpc.drac
-    version: 1.1.5
+    version: 1.1.6
   - src: stackhpc.drac-facts
     version: 1.0.0
   - src: stackhpc.grafana-conf