chore(rds): add MariaDB versions 10.11.13 and 11.4.7

[Tietew]

Reason for this change

New MariaDB versions are available.
Note: Link to the release note will be available later.

Description of changes

$ aws --region us-east-1 rds describe-db-engine-versions --engine mariadb --query 'DBEngineVersions[].EngineVersion'
[
    "10.5.20",
    "10.5.21",
    "10.5.22",
    "10.5.23",
    "10.5.24",
    "10.5.25",
    "10.5.26",
    "10.5.27",
    "10.5.28",
    "10.5.29",
    "10.6.13",
    "10.6.14",
    "10.6.15",
    "10.6.16",
    "10.6.17",
    "10.6.18",
    "10.6.19",
    "10.6.20",
    "10.6.21",
    "10.6.22",
    "10.11.4",
    "10.11.5",
    "10.11.6",
    "10.11.7",
    "10.11.8",
    "10.11.9",
    "10.11.10",
    "10.11.11",
    "10.11.13",
    "11.4.3",
    "11.4.4",
    "11.4.5",
    "11.4.7"
]

Describe any new or updated permissions being added

N/A

Description of how you validated changes

Added versions to unit test.

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-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 8fb0238
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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