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/energy_scale_utils.robot b/lib/energy_scale_utils.robot
index c6bd94f..668adc3 100755
--- a/lib/energy_scale_utils.robot
+++ b/lib/energy_scale_utils.robot
@@ -26,7 +26,7 @@
 
     ${power_limit_watts}=  Redfish.Get Attribute  ${power_cap_uri}   PowerLimitWatts
 
-    [return]  ${power_limit_watts}
+    RETURN  ${power_limit_watts}
 
 
 DCMI Power Get Limits
@@ -49,7 +49,7 @@
     ${output}=  Remove String  ${output}  milliseconds
     ${output}=  Remove String  ${output}  seconds
     &{limits}=  Key Value Outbuf To Dict  ${output}
-    [Return]  &{limits}
+    RETURN  &{limits}
 
 
 Get DCMI Power Limit
@@ -58,7 +58,7 @@
 
     &{limits}=  DCMI Power Get Limits
     ${power_setting}=  Get From Dictionary  ${limits}  power_limit
-    [Return]  ${power_setting}
+    RETURN  ${power_setting}
 
 
 Set DCMI Power Limit And Verify
@@ -114,7 +114,7 @@
     ...  watts setting using REST interface.
 
     ${power_limit}=  Read Attribute  ${CONTROL_HOST_URI}power_cap  PowerCap
-    [Return]  ${power_limit}
+    RETURN  ${power_limit}
 
 
 Set DCMI Power Limit Via REST
@@ -172,7 +172,7 @@
 
     ${power_activation_setting}=  Read Attribute
     ...  ${CONTROL_HOST_URI}power_cap  PowerCapEnable
-    [Return]  ${power_activation_setting}
+    RETURN  ${power_activation_setting}
 
 
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