chore(rds): deprecate MariaDB 10.4

[Tietew]

Reason for this change

MariaDB 10.4 and minor versions have been removed from available MaraiDB engine versions.

Description of changes

Deprecate MariaDB engine versions: 10.4 and 10.4.x

Describe any new or updated permissions being added

N/A

Description of how you validated 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",
    "11.4.3",
    "11.4.4",
    "11.4.5"
]

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

[mergify]

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).

[mergify]

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).

[GavinZZ]

@mergify update

[mergify]

update

☑️ Nothing to do, the required conditions are not met

• queue-position = -1 [📌 update requirement]
• #commits-behind > 0 [📌 update requirement]
• -closed [📌 update requirement]
• -conflict [📌 update requirement]

[mergify]

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).

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 018f31f
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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