[jOOQ/jOOQ#14571] Fix regression of [jOOQ/jOOQ#13574] for Oracle

UpdatableRecord::merge produces its update count in ctx.rows() for Oracle (and some others). That update count was discarded previously, although prior to fixing [jOOQ/jOOQ#14571], the initial value of result = 1 coincidentally produced the expected result.

jOOQ/src/main/java/org/jooq/impl/AbstractDMLQuery.java

@@ -1236,7 +1236,8 @@ abstract class AbstractDMLQuery<R extends Record> extends AbstractRowCountQuery
                 // [#13574] The DML statement itself may have produced a rowcount
                 //          but the returned results might be empty, so keep the
                 //          higher value of the two
-                result = Math.max(result, returnedResult.size());
+                // [#14571] The DML rowcount may have already been set to ctx.rows()
+                result = Math.max(Math.max(result, ctx.rows()), returnedResult.size());
                 ctx.rows(result);
             }