Test "Truncate verbose CauseOfBlockage messages in queue"

Pull request:

* jenkinsci/jenkins#11298

Author: MarkEWaite

pom.xml

@@ -30,7 +30,7 @@
   <properties>
     <changelist>999999-SNAPSHOT</changelist>
     <spotbugs.skip>true</spotbugs.skip>
-    <jenkins.version>2.539</jenkins.version>
+    <jenkins.version>2.540-rc37758.11334da_85d4a_</jenkins.version>
     <selenium.version>4.38.0</selenium.version>
     <!-- aligned with selenium -->
     <guava.version>33.5.0-jre</guava.version>