chore(rds): support 5.7.44-rds.20240808 for RDS for MySQL

[mazyu36]

Add new instance engine.

Ref: Amazon RDS for MySQL announces Extended Support minor 5.7.44-RDS.20240808

% aws rds describe-db-engine-versions --engine mysql --query "DBEngineVersions[].EngineVersion" --output table --region us-east-1
--------------------------
|DescribeDBEngineVersions|
+------------------------+
|  5.7.44                |
|  5.7.44-rds.20240408   |
|  5.7.44-rds.20240529   |
|  5.7.44-rds.20240808   | // this
|  8.0.32                |
|  8.0.33                |
|  8.0.34                |
|  8.0.35                |
|  8.0.36                |
|  8.0.37                |
|  8.0.39                |
+------------------------+

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: 2cc7ae6
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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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).

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