Use java 11 for chainsaw build

Forgot we updated this.
diff --git a/chainsaw/Jenkinsfile b/chainsaw/Jenkinsfile
index 6778251..b8ccaeb 100644
--- a/chainsaw/Jenkinsfile
+++ b/chainsaw/Jenkinsfile
@@ -31,7 +31,7 @@
         lib 'logging'
     }
     tools {
-        jdk 'jdk_1.8_latest'
+        jdk 'jdk_11_latest'
         maven 'maven_3_latest'
     }
     stages {