Potential fix for pull request finding

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

Author: daniellansun

src/spec/test/AsyncAwaitSpecTest.groovy

@@ -700,7 +700,9 @@ import java.util.concurrent.SubmissionPublisher
 
 def publisher = new SubmissionPublisher<String>()
 Thread.start {
-    Thread.sleep(200)
+    while (publisher.numberOfSubscribers == 0) {
+        Thread.yield()
+    }
     publisher.submit("hello from publisher")
     publisher.close()
 }