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/ipmi/test_ipmi_fru_device.robot b/ipmi/test_ipmi_fru_device.robot
index dd2d225..d3376c5 100644
--- a/ipmi/test_ipmi_fru_device.robot
+++ b/ipmi/test_ipmi_fru_device.robot
@@ -211,7 +211,7 @@
         Set To Dictionary  ${fru}  ${serial_number}  ${tmp}
     END
 
-    [Return]  ${fru}
+    RETURN  ${fru}
 
 
 Get DBUS Dictionary For FRU Devices
@@ -316,7 +316,7 @@
     ${resp}=  Run IPMI Command  ${IPMI_RAW_CMD['FRU']['Inventory_Area_Info'][0]} ${fru_device_id}
     ${resp}=  Split String  ${resp}
 
-    [Return]  ${resp[0]}
+    RETURN  ${resp[0]}
 
 
 Read FRU Data Via IPMI
@@ -332,7 +332,7 @@
     ${resp}=  Run IPMI Command
     ...  ${IPMI_RAW_CMD['FRU']['Read'][0]} ${fru_id} ${offset} 0xff
 
-    [Return]  ${resp}
+    RETURN  ${resp}
 
 
 Write FRU Data Via IPMI
@@ -365,7 +365,7 @@
     ${string}=  Generate Random String  ${initial_fru_length}  [LETTERS]
     ${frudata_prefixed}  ${fru_data}=  Identify Request Data  ${string}
 
-    [Return]  ${frudata_prefixed}  ${fru_data}
+    RETURN  ${frudata_prefixed}  ${fru_data}
 
 
 Get Default FRU Data