chore(rds): support 11.4.3 engine version for MariaDB

[mazyu36]

Add new engine version

Ref: https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/MariaDB.Concepts.VersionMgmt.html#MariaDB.Concepts.VersionMgmt.Supported

% aws rds describe-db-engine-versions --engine mariadb --query "DBEngineVersions[?EngineVersion=='11.4.3'].[DBEngineVersionDescription,EngineVersion,DBParameterGroupFamily,MajorEngineVersion,Status]" --output json
[
    [
        "MariaDB 11.4.3",
        "11.4.3",
        "mariadb11.4",
        "11.4",
        "available"
    ]
]

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

---

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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AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 25e1ace
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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