Add correct response code for invalid attribute value update

Changes:
Redfish patch operation can also throw 403 error code
when invalid attribute value is updated

Tested:
Tested changes on BMC environment

Change-Id: I20cb94171212d2f6eb1b168b634c97613dd67797
Signed-off-by: Sridevi Ramesh <sridevra@in.ibm.com>
diff --git a/pldm/test_redfish_bios_attributes.robot b/pldm/test_redfish_bios_attributes.robot
index 93373f8..f1ca265 100755
--- a/pldm/test_redfish_bios_attributes.robot
+++ b/pldm/test_redfish_bios_attributes.robot
@@ -44,7 +44,7 @@
     ${enum_attr}=  Evaluate  random.choice(${attr_handles})  modules=random
 
     Redfish.Patch  ${BIOS_ATTR_SETTINGS_URI}  body={"Attributes":{"${enum_attr}": '0'}}
-    ...  valid_status_codes=[${HTTP_BAD_REQUEST}]
+    ...  valid_status_codes=[${HTTP_BAD_REQUEST}, ${HTTP_FORBIDDEN}]
 
 
 Redfish Verify Set Out Of Range Integer Value For BIOS Integer Attribute Type