Drop container image pre-pull since this is proxied now on CI anyway

Author: beikov

ci/jpa-3.1-tck.Jenkinsfile

@@ -42,9 +42,6 @@ pipeline {
             stages {
                 stage('Build') {
                     steps {
-                        script {
-                            docker.image('openjdk:11-jdk').pull()
-                        }
                         dir('hibernate') {
                             checkout scm
                             sh './gradlew publishToMavenLocal -PmavenMirror=nexus-load-balancer-c4cf05fd92f43ef8.elb.us-east-1.amazonaws.com -DjakartaJpaVersion=3.1.0'