feat(rds): support aurora postgresql 14.8

[ronocod]

Add Aurora PostgreSQL 14.8 to database cluster engine.
https://docs.aws.amazon.com/AmazonRDS/latest/AuroraPostgreSQLReleaseNotes/AuroraPostgreSQL.Updates.html#AuroraPostgreSQL.Updates.20180305.148X

S3 import and s3 export features are supported.

$ aws rds describe-db-engine-versions --region us-east-1 --engine aurora-postgresql --engine-version 14.8
{
    "DBEngineVersions": [
        {
            "Engine": "aurora-postgresql",
            "EngineVersion": "14.8",
            "DBParameterGroupFamily": "aurora-postgresql14",
            "DBEngineDescription": "Aurora (PostgreSQL)",
            "DBEngineVersionDescription": "Aurora PostgreSQL (Compatible with PostgreSQL 14.8)",
            "ValidUpgradeTarget": [
                {
                    "Engine": "aurora-postgresql",
                    "EngineVersion": "15.3",
                    "Description": "Aurora PostgreSQL (Compatible with PostgreSQL 15.3)",
                    "AutoUpgrade": false,
                    "IsMajorVersionUpgrade": true,
                    "SupportedEngineModes": [
                        "provisioned"
                    ],
                    "SupportsParallelQuery": false,
                    "SupportsGlobalDatabases": true,
                    "SupportsBabelfish": true
                }
            ],
            "ExportableLogTypes": [
                "postgresql"
            ],
            "SupportsLogExportsToCloudwatchLogs": true,
            "SupportsReadReplica": false,
            "SupportedEngineModes": [
                "provisioned"
            ],
            "SupportedFeatureNames": [
                "Comprehend",
                "Lambda",
                "s3Export",
                "s3Import",
                "SageMaker"
            ],
            "Status": "available",
            "SupportsParallelQuery": false,
            "SupportsGlobalDatabases": true,
            "MajorEngineVersion": "14",
            "SupportsBabelfish": true,
            "SupportsCertificateRotationWithoutRestart": true,
            "SupportedCACertificateIdentifiers": [
                "rds-ca-2019",
                "rds-ca-ecc384-g1",
                "rds-ca-rsa4096-g1",
                "rds-ca-rsa2048-g1"
            ]
        }
    ]
}

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

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Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).