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/snmp/redfish_snmp_utils.robot b/lib/snmp/redfish_snmp_utils.robot
index 57424aa..9045143 100644
--- a/lib/snmp/redfish_snmp_utils.robot
+++ b/lib/snmp/redfish_snmp_utils.robot
@@ -60,7 +60,7 @@
       Append To List  ${snmp_mgr_list}  ${snmp_mgr}
     END
 
-    [Return]  ${snmp_mgr_list}
+    RETURN  ${snmp_mgr_list}
 
 
 Configure SNMP Manager Via Redfish
@@ -139,7 +139,7 @@
     # Get the list of child URIs.
     @{snmp_mgr_uris}=  Redfish.Get Members List  ${subscription_uri}  filter=snmp
 
-    [Return]  ${snmp_mgr_uris}
+    RETURN  ${snmp_mgr_uris}
 
 
 Delete SNMP Manager Via Redfish
@@ -228,7 +228,7 @@
 
     Verify SNMP Trap  ${snmp_trap}  ${expected_error}
 
-    [Return]  ${snmp_trap}
+    RETURN  ${snmp_trap}
 
 
 Verify SNMP Trap
@@ -299,7 +299,7 @@
 
     Verify SNMP Trap  ${snmp_trap}  ${expected_error}
 
-    [Return]  ${snmp_trap}
+    RETURN  ${snmp_trap}
 
 
 Start SNMP Manager On Specific Port
@@ -355,5 +355,5 @@
 
     Verify SNMP Trap  ${snmp_trap}  ${expected_error}
 
-    [Return]  ${snmp_trap}
+    RETURN  ${snmp_trap}