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/esel_utils.robot b/lib/esel_utils.robot
index 5423a66..5af58dd 100755
--- a/lib/esel_utils.robot
+++ b/lib/esel_utils.robot
@@ -37,7 +37,7 @@
     ${resp}=  OpenBMC Get Request  ${BMC_LOGGING_ENTRY}
     Should Be Equal As Strings  ${resp.status_code}  ${HTTP_OK}
     ${count}=  Get Length  ${resp.json()["data"]}
-    [Return]  ${count}
+    RETURN  ${count}
 
 
 Verify eSEL Entries