databases/cego: update 2.54.7 -> 2.54.9

• fix CegoAdminThread::srvVerifyTableSet for view loop iterator
• Before decoding values via CegoQueryHelper::decodeFVL, the btree schema has to be sorted in terms of field id. Otherwise, decoding might be not complete in case of non-ascending btree attributes. fix in CegoBtreeNode::verifyLeafFull