chore(rds): add support for 8.0.mysql_aurora.3.04.3 (#32399)

(description based on #30479)

### Reason for this change

Add support for newly supported 8.0.mysql_aurora.3.04.3.
https://docs.aws.amazon.com/AmazonRDS/latest/AuroraMySQLReleaseNotes/AuroraMySQL.Updates.3043.html

### Description of changes

Add a new version as a new property to AuroraMysqlEngineVersion class.

### Description of how you validated changes

I used the AWS CLI to verify that the new version is available.
```
aws rds describe-db-engine-versions --engine aurora-mysql --query "DBEngineVersions[?EngineVersion=='8.0.mysql_aurora.3.04.3']"
[
    {
        "Engine": "aurora-mysql",
        "EngineVersion": "8.0.mysql_aurora.3.04.3",
        "DBParameterGroupFamily": "aurora-mysql8.0",
        "DBEngineDescription": "Aurora MySQL",
        "DBEngineVersionDescription": "Aurora MySQL 3.04.3 (compatible with MySQL 8.0.28)",
        "ValidUpgradeTarget": [
            {
                "Engine": "aurora-mysql",
                "EngineVersion": "8.0.mysql_aurora.3.06.1",
                "Description": "Aurora MySQL 3.06.1 (compatible with MySQL 8.0.34)",
                "AutoUpgrade": false,
                "IsMajorVersionUpgrade": false,
                "SupportedEngineModes": [
                    "provisioned"
                ],
                "SupportsParallelQuery": true,
                "SupportsGlobalDatabases": true,
                "SupportsBabelfish": false,
                "SupportsLocalWriteForwarding": true
            },
            {
                "Engine": "aurora-mysql",
                "EngineVersion": "8.0.mysql_aurora.3.07.1",
                "Description": "Aurora MySQL 3.07.1 (compatible with MySQL 8.0.36)",
                "AutoUpgrade": false,
                "IsMajorVersionUpgrade": false,
                "SupportedEngineModes": [
                    "provisioned"
                ],
                "SupportsParallelQuery": true,
                "SupportsGlobalDatabases": true,
                "SupportsBabelfish": false,
                "SupportsLocalWriteForwarding": true
            },
            {
                "Engine": "aurora-mysql",
                "EngineVersion": "8.0.mysql_aurora.3.08.0",
                "Description": "Aurora MySQL 3.08.0 (compatible with MySQL 8.0.39)",
                "AutoUpgrade": false,
                "IsMajorVersionUpgrade": false,
                "SupportedEngineModes": [
                    "provisioned"
                ],
                "SupportsParallelQuery": true,
                "SupportsGlobalDatabases": true,
                "SupportsBabelfish": false,
                "SupportsLocalWriteForwarding": true
            }
        ],
        "ExportableLogTypes": [
            "audit",
            "error",
            "general",
            "slowquery"
        ],
        "SupportsLogExportsToCloudwatchLogs": true,
        "SupportsReadReplica": false,
        "SupportedEngineModes": [
            "provisioned"
        ],
        "SupportedFeatureNames": [],
        "Status": "available",
        "SupportsParallelQuery": true,
        "SupportsGlobalDatabases": true,
        "MajorEngineVersion": "8.0",
        "SupportsBabelfish": false,
        "SupportsCertificateRotationWithoutRestart": true,
        "SupportedCACertificateIdentifiers": [
            "rds-ca-ecc384-g1",
            "rds-ca-rsa4096-g1",
            "rds-ca-rsa2048-g1"
        ],
        "SupportsLocalWriteForwarding": true
    }
]
```

### Checklist
- [x] My code adheres to the [CONTRIBUTING GUIDE](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md) and [DESIGN GUIDELINES](https://github.com/aws/aws-cdk/blob/main/docs/DESIGN_GUIDELINES.md)

----

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

Author: hiromu-ootsuka

packages/aws-cdk-lib/aws-rds/lib/cluster-engine.ts

@@ -616,6 +616,8 @@ export class AuroraMysqlEngineVersion {
   public static readonly VER_3_04_1 = AuroraMysqlEngineVersion.builtIn_8_0('3.04.1');
   /** Version "8.0.mysql_aurora.3.04.2". */
   public static readonly VER_3_04_2 = AuroraMysqlEngineVersion.builtIn_8_0('3.04.2');
+  /** Version "8.0.mysql_aurora.3.04.3". */
+  public static readonly VER_3_04_3 = AuroraMysqlEngineVersion.builtIn_8_0('3.04.3');
   /**
    * Version "8.0.mysql_aurora.3.05.0"
    * @deprecated Aurora MySQL 8.0.mysql_aurora.3.05.0 is no longer supported by Amazon RDS.