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/managers/test_bmc_dumps.robot b/redfish/managers/test_bmc_dumps.robot
index 756dadc..78cac89 100644
--- a/redfish/managers/test_bmc_dumps.robot
+++ b/redfish/managers/test_bmc_dumps.robot
@@ -488,7 +488,7 @@
     Create Binary File  BMC_dump.tar.gz  ${ret.content}
     ${downloaded_dump_size}=  Get File Size  BMC_dump.tar.gz
     Should Be Equal  ${downloaded_dump_size}  ${redfish_bmc_dump_size}
-    [Return]  BMC_dump.tar.gz
+    RETURN  BMC_dump.tar.gz
 
 
 Extract BMC Dump
@@ -518,7 +518,7 @@
     ${cnt}=  Get length  ${bmc_extraction_folders}
     should be equal as numbers  ${cnt}  1
 
-    [Return]  ${bmc_extraction_folders}[0]
+    RETURN  ${bmc_extraction_folders}[0]
 
 
 Get BMC Dump Entries
@@ -532,7 +532,7 @@
       Append To List  ${dump_ids}  ${dump_id}
     END
 
-    [Return]  ${dump_ids}
+    RETURN  ${dump_ids}
 
 
 Is BMC Dump Available
@@ -557,7 +557,7 @@
     ${usage_output}=  Fetch From Left  ${usage_output}  /
     ${usage_output}=  Convert To Integer  ${usage_output}
 
-    [return]  ${usage_output}
+    RETURN  ${usage_output}
 
 
 Test Teardown Execution