LUCENE-8930: increase timeout for the launched luke.

Author: dweiss

lucene/distribution.tests/src/test/org/apache/lucene/distribution/TestScripts.java

@@ -62,7 +62,7 @@ public void testLukeCanBeLaunched() throws Exception {
     execute(
         launcher,
         0,
-        5,
+        20,
         (output) -> {
           Assertions.assertThat(output).contains("[Vader] Hello, Luke.");
         });