feat(rds): add support for postgresql 11.21, 12.16, 13.12, 14.9, 15.4 and deprecate versions out-of-support

[robertd]

https://docs.aws.amazon.com/AmazonRDS/latest/PostgreSQLReleaseNotes/postgresql-release-calendar.html

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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).