Fix integration test

Author: bzablocki

sdks/java/io/solace/src/test/java/org/apache/beam/sdk/io/solace/it/SolaceIOMultipleSempIT.java

@@ -172,7 +172,7 @@ private Pipeline createWriterPipeline(
                 .withWriterType(writerType)
                 .withDeliveryMode(DeliveryMode.PERSISTENT)
                 .withNumberOfClientsPerWorker(1)
-                .withMaxNumOfUsedWorkers(1)
+                .withNumShards(1)
                 .withSessionServiceFactory(
                     BasicAuthJcsmpSessionServiceFactory.builder()
                         .host("localhost:" + solaceContainerJcsmpPort)