Updates a manual DB snapshot, which can be encrypted or not encrypted,with a new engine version.Show details from next link. https://docs.aws.amazon.com/ja_jp/cli/latest/reference/rds/modify-db-snapshot.html
| aws rds modify-db-snapshot \ |
| Upgrading an Oracle DB Snapshot - Amazon Relational Database Service : http://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_UpgradeDBSnapshot.MySQL.html |