test: Fix invalid foo option in ITPipelineTest

Author: wu-hui

google-cloud-firestore/src/test/java/com/google/cloud/firestore/it/ITPipelineTest.java

@@ -3883,7 +3883,11 @@ public void testPipelineInTransactionsWithOptions() throws Exception {
     firestore
         .runTransaction(
             transaction -> {
-              PipelineExecuteOptions options = new PipelineExecuteOptions().with("foo", "bar");
+              PipelineExecuteOptions options =
+                  new PipelineExecuteOptions()
+                      .withExplainOptions(
+                          new ExplainOptions()
+                              .withExecutionMode(ExplainOptions.ExecutionMode.ANALYZE));
               List<PipelineResult> results =
                   transaction.execute(pipeline, options).get().getResults();
               assertThat(results).hasSize(1);