Fix pipeline delegation context

.ci/Jenkinsfile

@@ -78,6 +78,7 @@ pipeline {
 			}
 
 			steps {
+				script {
 					["${env.JOB_BASE_NAME}2"].each {
 						/* Set next build number for this job. */
 						def job = Jenkins.instance.getItem(it)
@@ -96,4 +97,5 @@ pipeline {
 				}
 			}
 		}
+	}
 }