chore(rds): add aurora postgresql versions 12.18, 13.14 and 14.11

[mazyu36]

Description of changes

Add three AuroraPostgreSQL version.

https://docs.aws.amazon.com/AmazonRDS/latest/AuroraPostgreSQLReleaseNotes/AuroraPostgreSQL.Updates.html#AuroraPostgreSQL.Updates.20180305.1218X

https://docs.aws.amazon.com/AmazonRDS/latest/AuroraPostgreSQLReleaseNotes/AuroraPostgreSQL.Updates.html#AuroraPostgreSQL.Updates.20180305.1314

https://docs.aws.amazon.com/AmazonRDS/latest/AuroraPostgreSQLReleaseNotes/AuroraPostgreSQL.Updates.html#AuroraPostgreSQL.Updates.20180305.14110

Description of how you validated changes

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

[go-to-k]

Could you please change the PR title to chore(rds): add aurora postgresql versions 12.18, 13.14 and 14.11? There are only three, so it would be fine to write them down and they would be easy to understand.

[mazyu36]

@go-to-k
Thank you for your review.
I changed the title.

[go-to-k]

Thanks, LGTM.

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AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 9e84793
• Result: SUCCEEDED
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