chore(rds): support 11.22-rds.20240808 for RDS PostgreSQL

[mazyu36]

Add new instance engine.

Ref: Amazon RDS for PostgreSQL announces Extended Support minor 11.22-RDS.20240808

% aws rds describe-db-engine-versions --engine postgres --query "DBEngineVersions[].EngineVersion" --output table --region us-east-1
--------------------------
|DescribeDBEngineVersions|
+------------------------+
// omit
|  11.22-rds.20240808    |
// omit

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: 86aa20a
• 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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