Use Java 11 for Chainsaw build
diff --git a/vars/mvn.groovy b/vars/mvn.groovy
index fce6a17..d1adb2e 100644
--- a/vars/mvn.groovy
+++ b/vars/mvn.groovy
@@ -26,7 +26,7 @@
             javaVersion = '11'
         }
     } else if (env.JOB_NAME.startsWith('Logging/chainsaw')) {
-        javaVersion = '9'
+        javaVersion = '11'
     }
     String javaHome = tool "jdk_${javaVersion}_latest"
     if (isUnix()) {