Update durable-task and prevent tests from stealing focus

Author: dwnusbaum

Diff for: pom.xml

@@ -78,7 +78,7 @@
         <dependency>
             <groupId>org.jenkins-ci.plugins</groupId>
             <artifactId>durable-task</artifactId>
-            <version>1.26</version>
+            <version>1.29</version>
         </dependency>
         <dependency>
             <groupId>org.jenkins-ci.plugins.workflow</groupId>

Diff for: src/test/java/org/jenkinsci/plugins/workflow/support/steps/ExecutorStepTest.java

@@ -213,7 +213,7 @@ public class ExecutorStepTest {
     private static Process jnlpProc;
     private void startJnlpProc() throws Exception {
         killJnlpProc();
-        ProcessBuilder pb = new ProcessBuilder(JavaEnvUtils.getJreExecutable("java"), "-jar", Which.jarFile(Launcher.class).getAbsolutePath(), "-jnlpUrl", story.j.getURL() + "computer/dumbo/slave-agent.jnlp");
+        ProcessBuilder pb = new ProcessBuilder(JavaEnvUtils.getJreExecutable("java"), "-Djava.awt.headless=true", "-jar", Which.jarFile(Launcher.class).getAbsolutePath(), "-jnlpUrl", story.j.getURL() + "computer/dumbo/slave-agent.jnlp");
         pb.redirectErrorStream(true);
         System.err.println("Running: " + pb.command());
         jnlpProc = pb.start();