Added version 23 assumption for VECTOR test

Author: Michael-A-McMahon

src/test/java/oracle/r2dbc/impl/OracleStatementImplTest.java

@@ -3281,6 +3281,8 @@ else if (segment instanceof Message) {
 
   @Test
   public void testVectorReturningExample() {
+    assumeTrue(databaseVersion() >= 23); // VECTOR is not added until 23.4
+
     Connection connection = awaitOne(sharedConnection());
     try {
       awaitExecution(connection.createStatement(