check schema agreement for PreparedStatementCachingIT

Author: SiyaoIsHiding

integration-tests/src/test/java/com/datastax/oss/driver/core/cql/PreparedStatementCachingIT.java

@@ -266,6 +266,8 @@ private void invalidationTestInner(
       // alter test_type_2 to trigger cache invalidation and above events
       session.execute("ALTER TYPE test_type_2 add i blob");
 
+      session.checkSchemaAgreement();
+
       // wait for latches and fail if they don't reach zero before timeout
       assertThat(
               Uninterruptibles.awaitUninterruptibly(