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/lib/bmc_redfish_utils.robot b/lib/bmc_redfish_utils.robot
index fbac104..1e8bb10 100644
--- a/lib/bmc_redfish_utils.robot
+++ b/lib/bmc_redfish_utils.robot
@@ -170,7 +170,7 @@
         ...    Append To List  ${client_id_sessions}  ${session}
     END
 
-    [Return]  ${client_id_sessions}
+    RETURN  ${client_id_sessions}
 
 
 Get Valid FRUs
@@ -186,7 +186,7 @@
     ...  /redfish/v1/Systems/${SYSTEM_ID}/${fru_type}  return_json=0
     ${fru_records}=  Filter Struct  ${fru_records}  [('State', 'Enabled'), ('Health', 'OK')]
 
-    [Return]  ${fru_records}
+    RETURN  ${fru_records}
 
 
 Get Num Valid FRUs
@@ -199,7 +199,7 @@
     ${fru_records}=  Get Valid FRUs  ${fru_type}
     ${num_valid_frus}=  Get length  ${fru_records}
 
-    [Return]  ${num_valid_frus}
+    RETURN  ${num_valid_frus}
 
 
 Verify Valid Records
@@ -238,7 +238,7 @@
     ...  [('Health', '^OK$'), ('State', '^Enabled$'), ('${reading_type}', '')]  regex=1  invert=1
     Valid Length  invalid_records  max_length=0
 
-    [Return]  ${records}
+    RETURN  ${records}
 
 
 Redfish Create User
@@ -282,7 +282,7 @@
     ${role_config}=  Redfish_Utils.Get Attribute
     ...  ${REDFISH_ACCOUNTS_URI}${user_name}  RoleId
 
-    [Return]  ${role_config}
+    RETURN  ${role_config}
 
 
 Create Users With Different Roles
@@ -378,4 +378,4 @@
 
     ${last_reset_time}=  Redfish.Get Attribute  /redfish/v1/Managers/${MANAGER_ID}  LastResetTime
 
-    [Return]  ${last_reset_time}
+    RETURN  ${last_reset_time}