fix: java main process will be suspended when browsers installation timed out (#180)

driver-bundle/src/main/java/com/microsoft/playwright/impl/DriverJar.java

@@ -45,6 +45,7 @@ public class DriverJar extends Driver {
     Process p = pb.start();
     boolean result = p.waitFor(10, TimeUnit.MINUTES);
     if (!result) {
+      p.destroy();
       throw new RuntimeException("Timed out waiting for browsers to install");
     }
   }