jenkins: upgrade to latest

Change-Id: I962da5830cb25e4c64539b27f57f89b5501252e5
diff --git a/jessie-amd64-jenkins-master/Dockerfile b/jessie-amd64-jenkins-master/Dockerfile
index ac5af8b..dd1d366 100644
--- a/jessie-amd64-jenkins-master/Dockerfile
+++ b/jessie-amd64-jenkins-master/Dockerfile
@@ -1,4 +1,4 @@
-FROM jenkins/jenkins:2.303.2-lts-slim
+FROM jenkins/jenkins:2.303.3-lts-slim
 
 ENV JENKINS_JAVA_PARAMETERS="-server -XX:+AlwaysPreTouch -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=/var/log/jenkins/heapdump.log -XX:+UseG1GC -XX:+UseStringDeduplication -XX:+ParallelRefProcEnabled -XX:+ExplicitGCInvokesConcurrent -XX:+UnlockDiagnosticVMOptions -XX:G1SummarizeRSetStatsPeriod=1 -XX:MaxMetaspaceExpansion=64M -Djenkins.model.Jenkins.logStartupPerformance=true"