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_sel.robot b/ipmi/test_ipmi_sel.robot
index 3207cf9..f31d616 100644
--- a/ipmi/test_ipmi_sel.robot
+++ b/ipmi/test_ipmi_sel.robot
@@ -388,7 +388,7 @@
     ${resp}=  Run IPMI Command  ${cmd}
     ${resp}=  Split String  ${resp}
 
-    [Return]  ${resp}
+    RETURN  ${resp}
 
 
 Get Most Recent Addition Timestamp From SEL Info
@@ -402,7 +402,7 @@
     Reverse List  ${addition_timestamp}
     ${addition_timestamp}=  Evaluate  "".join(${addition_timestamp})
 
-    [Return]  ${addition_timestamp}
+    RETURN  ${addition_timestamp}
 
 
 Get Most Recent Erase Timestamp From SEL Info
@@ -416,7 +416,7 @@
     Reverse List  ${erase_timestamp}
     ${erase_timestamp}=  Evaluate  "".join(${erase_timestamp})
 
-    [Return]  ${erase_timestamp}
+    RETURN  ${erase_timestamp}
 
 
 Get SEL Elist Last Entry Date In Epoch
@@ -429,7 +429,7 @@
     ${sel_entry_date}=  Fetch Added SEL Date  ${resp}
     ${epoch_date}=  Convert Date  ${sel_entry_date}  epoch  exclude_millis=yes  date_format=%m/%d/%Y %H:%M:%S
 
-    [Return]  ${epoch_date}
+    RETURN  ${epoch_date}
 
 
 Get BMC Time In Epoch
@@ -440,7 +440,7 @@
 
     ${epoch_date}=  Convert Date  ${date}  epoch  exclude_millis=yes  date_format=%m/%d/%Y %H:%M:%S
 
-    [Return]   ${epoch_date}
+    RETURN   ${epoch_date}
 
 
 Install Tarball For Error Creation