Update the timeout on the tx task .get() since it was way too small.

Author: Justin Breitfeller

tests/objectbox-java-test/src/test/java/io/objectbox/TransactionTest.java

@@ -456,7 +456,7 @@ public void transactionsOnLargeThreadPool() throws Exception {
 
         //Iterate through all the txTasks and make sure all transactions succeeded.
         for (Future<Integer> txTask : txTasks) {
-            txTask.get(1, TimeUnit.MILLISECONDS);
+            txTask.get(1, TimeUnit.SECONDS);
         }
     }
 }