Update .lastmerge to e42b726ca42bd1b2e099a956c9287ba9435ba3e5, sync pom.xml CLI version, and update scripts/codegen @github/copilot version

Co-authored-by: edburns <75821+edburns@users.noreply.github.com>

Author: Copilot

.lastmerge

@@ -1 +1 @@
-dd2dcbc439256acfb9feb2cff07c0b9c820091b8
+e42b726ca42bd1b2e099a956c9287ba9435ba3e5

pom.xml

@@ -94,7 +94,7 @@
             reference-impl-sync workflow and deal with the subsequent
             PR.
         -->
-        <readonly-copilot-sdk-ref-impl-version-from-lastmerge-file-updated-by-reference-impl-sync>^1.0.36-0</readonly-copilot-sdk-ref-impl-version-from-lastmerge-file-updated-by-reference-impl-sync>
+        <readonly-copilot-sdk-ref-impl-version-from-lastmerge-file-updated-by-reference-impl-sync>^1.0.40-0</readonly-copilot-sdk-ref-impl-version-from-lastmerge-file-updated-by-reference-impl-sync>
 
     </properties>