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/openpower/ext_interfaces/test_savearea_management.robot b/openpower/ext_interfaces/test_savearea_management.robot
index c251093..5493d62 100644
--- a/openpower/ext_interfaces/test_savearea_management.robot
+++ b/openpower/ext_interfaces/test_savearea_management.robot
@@ -411,7 +411,7 @@
     Return From Keyword If  '${status}' == 'False'  ${resp_text}
     ${message}=  Evaluate  json.loads('''${resp_text}''')  json
 
-    [Return]  ${message["Description"]}
+    RETURN  ${message["Description"]}
 
 
 Upload Partition File To BMC
@@ -631,7 +631,7 @@
        Set To Dictionary  ${content_dict}  ${conf_file}  ${content-${index}}
     END
 
-    [Return]  &{content_dict}
+    RETURN  &{content_dict}
 
 
 Redfish Read Partition File
@@ -747,7 +747,7 @@
     FOR  ${count}  IN RANGE  ${range}
       Append To List  ${file_name_list}  1KB-file${count}
     END
-    [Return]  ${file_name_list}
+    RETURN  ${file_name_list}
 
 
 Redfish Upload Partition File With Range