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_ldap_configuration.robot b/redfish/account_service/test_ldap_configuration.robot
index d484900..28119e2 100644
--- a/redfish/account_service/test_ldap_configuration.robot
+++ b/redfish/account_service/test_ldap_configuration.robot
@@ -697,7 +697,7 @@
     # ldap_type  The LDAP type ("ActiveDirectory" or "LDAP").
 
     ${ldap_config}=  Redfish.Get Properties  ${REDFISH_BASE_URI}AccountService
-    [Return]  ${ldap_config["${ldap_type}"]}
+    RETURN  ${ldap_config["${ldap_type}"]}
 
 
 Update LDAP Configuration with LDAP User Role And Group
@@ -725,7 +725,7 @@
     ${num_list_entries}=  Get Length  ${ldap_config["RemoteRoleMapping"]}
     Return From Keyword If  ${num_list_entries} == ${0}  @{EMPTY}
 
-    [Return]  ${ldap_config["RemoteRoleMapping"][0]["LocalRole"]}
+    RETURN  ${ldap_config["RemoteRoleMapping"][0]["LocalRole"]}
 
 
 Restore LDAP Privilege