CI: Bump brats rds postgres version

[selzoc]

AWS no longer supports 15.10. Bump to 15.18, which is the latest version of 15 available.

ref: https://docs.aws.amazon.com/AmazonRDS/latest/PostgreSQLReleaseNotes/postgresql-release-calendar.html#PostgreSQL.Concepts.VersionMgmt.Supported

[coderabbitai]

Caution

Review failed

Pull request was closed or merged during review

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 3ed751b4-239f-4b4b-aba2-9b3a4901ba40

📥 Commits

Reviewing files that changed from the base of the PR and between 1e733d5 and f059ff0.

📒 Files selected for processing (1)

• ci/shared/brats/terraform/aws_postgres.tf

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Walkthrough

This pull request updates the PostgreSQL engine version for the AWS database instance used in CI testing from 15.10 to 15.18. The change modifies a single line in the Terraform configuration file that defines the database resource.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description provides the reason for the change (AWS no longer supports 15.10) and specifies the new version (15.18), but is missing several required template sections.	Add missing sections: contextual information/links, test results, release notes description, breaking change indicator, and team tags as specified in the template.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely summarizes the main change: bumping the PostgreSQL version for BRATS RDS in CI from 15.10 to 15.18.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch bump-brats-rds-postgres-version

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