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/redfish/account_service/test_redfish_privilege_registry.robot b/redfish/account_service/test_redfish_privilege_registry.robot
index 88ceceb..5225162 100644
--- a/redfish/account_service/test_redfish_privilege_registry.robot
+++ b/redfish/account_service/test_redfish_privilege_registry.robot
@@ -195,7 +195,7 @@
     ...  /redfish/v1/Registries/PrivilegeRegistry/
     @{location}=  Get From Dictionary  ${resp.dict}  Location
     ${uri}=   Set Variable   ${location[0]['Uri']}
-    [Return]   ${uri}
+    RETURN   ${uri}
 
 Create And Verify Various Privilege Users
     [Documentation]  Create and verify admin, test, operator, and readonly users.