Robot Framework 7.0 changes

Update robot code syntax overall in the repo

Changes:
   - Update the requirement.txt package version for robot
   - The '[Return]' setting is deprecated.
      Use the 'RETURN' statement instead.
   - Singular section headers like '*** Test Case ***'
     are deprecated. Use plural format like
     '*** Test Cases ***' instead.
   - Singular section headers like '*** Variable ***'
     are deprecated

Tested:
   - Ran from sandbox with the version
     $ robot --version
     Robot Framework 7.0 (Python 3.10.12 on linux)

     and also tested on latest python version

     Robot Framework 7.0 (Python 3.11.9 on linux)

Change-Id: I54e85f9d799556c63b9a39f79483f83e9b980768
Signed-off-by: George Keishing <gkeishin@in.ibm.com>
diff --git a/ipmi/test_ipmi_payload.robot b/ipmi/test_ipmi_payload.robot
index 9d9ec82..4f4b8f3 100644
--- a/ipmi/test_ipmi_payload.robot
+++ b/ipmi/test_ipmi_payload.robot
@@ -255,7 +255,7 @@
 
     ${payload_status}=  Set Variable  ${resp[1]}
 
-    [return]  ${payload_status}
+    RETURN  ${payload_status}
 
 
 Activate Payload
@@ -286,7 +286,7 @@
     ${raw_command}=  Catenate  ${IPMI_RAW_CMD['Payload']['Get_User_Access_Payload'][0]}
     ...  ${channel_number} ${user_id}
     ${resp}=  Run IPMI Command  ${raw_command}
-    [Return]  ${resp}
+    RETURN  ${resp}
 
 
 Create And Verify IPMI User
@@ -304,7 +304,7 @@
     Set And Verify User Access Privilege  ${random_user_id}  ${user_privilege_level}
     Verify Username And Password  ${random_user_name}  ${new_user_passwd}  L=${privilege}
 
-    [Return]  ${random_user_id}  ${random_user_name}
+    RETURN  ${random_user_id}  ${random_user_name}
 
 
 Set User Password
@@ -411,7 +411,7 @@
 
     ${resp}=  Run IPMI Command  ${set_cmd}
 
-    [Return]  ${resp}
+    RETURN  ${resp}
 
 
 Get Invalid User ID
@@ -427,7 +427,7 @@
     END
     ${invalid_user_id}=  Evaluate  random.choice(${invalid_userid_list})  random
 
-    [Return]  ${invalid_user_id}
+    RETURN  ${invalid_user_id}
 
 
 Verify Set User Access Payload For Invalid Channel