chore(rds): add latest Aurora MySQL and Aurora PostgreSQL engine versions

[rgoltz]

Issue # (if applicable)

Closes #37200.

Reason for this change

New Aurora engine versions have been released by AWS and are missing from the CDK's version constants.

Description of changes

Added new version constants to packages/aws-cdk-lib/aws-rds/lib/cluster-engine.ts:

Aurora PostgreSQL:

• VER_14_22
• VER_15_17
• VER_16_13
• VER_17_9

Aurora MySQL:

• VER_2_12_6
• VER_3_10_4

Describe any new or updated permissions being added

N/A

Description of how you validated changes

Verified via AWS CLI that the new versions are available:

$ aws rds describe-db-engine-versions --engine aurora-postgresql --query "DBEngineVersions[].EngineVersion" --output text 2>/dev/null | tr '\t' '\n' | sort -V
...
14.20
14.22
...
15.15
15.17
...
16.11
16.11-limitless
16.13
...
17.7
17.9

$ aws rds describe-db-engine-versions --engine aurora-mysql --query "DBEngineVersions[].EngineVersion" --output text 2>/dev/null | tr '\t' '\n' | sort -V
...
5.7.mysql_aurora.2.12.5
5.7.mysql_aurora.2.12.6
...
8.0.mysql_aurora.3.10.3
8.0.mysql_aurora.3.10.4
...

Note: No README, test, or snapshot changes required. This PR only adds new version constants following the existing pattern. Integration tests use a getLatestVersion() helper in packages/@aws-cdk-testing/framework-integ/test/aws-rds/test/db-versions.ts that dynamically resolves the highest version at runtime — new versions are automatically covered.

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

[Abogical]

Integration test deployment failure came from a snapshot update of a test integ.function-shell-bundling.js. This is not in this PR as it out of sync with main hence why it failed.

Other existing integ tests deployed successfully, however. Therefore I'm allowing this change in snapshots.

[github-actions]

⚠️ Experimental Feature: This security report is currently in experimental phase. Results may include false positives and the rules are being actively refined.
This security report is NOT a review blocker. Please try merge from main to avoid findings unrelated to the PR.
To suppress a specific rule, see Suppressing Rules.

---

	Tests	Passed ✅	Skipped	Failed
Security Guardian Results	312 ran	312 passed

Test	Result
No test annotations available

• View Security Guardian Results

[github-actions]

⚠️ Experimental Feature: This security report is currently in experimental phase. Results may include false positives and the rules are being actively refined.
This security report is NOT a review blocker. Please try merge from main to avoid findings unrelated to the PR.
To suppress a specific rule, see Suppressing Rules.

---

	Tests	Passed ✅	Skipped	Failed
Security Guardian Results with resolved templates	312 ran	312 passed

Test	Result
No test annotations available

• View Security Guardian Results with resolved templates

[mergify]

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).

[mergify]

Merge Queue Status

• ✅ Entered queue — 2026-04-17 12:16 UTC · Rule: default-squash
• ✅ Checks passed · in-place
• ✅ Merged — 2026-04-17 13:58 UTC · at 2bf5ba45cb428285de5401c1a64985d3ee83ad2f · squash

This pull request spent 1 hour 42 minutes 4 seconds in the queue, including 1 hour 41 minutes 47 seconds running CI.

Required conditions to merge

• #approved-reviews-by >= 1 [🛡 GitHub branch protection]
  • chore(rds): add latest Aurora MySQL and Aurora PostgreSQL engine versions #37488
• #changes-requested-reviews-by = 0 [🛡 GitHub branch protection]
  • chore(rds): add latest Aurora MySQL and Aurora PostgreSQL engine versions #37488
• any of [🛡 GitHub branch protection]:
  • check-success = validate-pr
  • check-neutral = validate-pr
  • check-skipped = validate-pr
• any of [🛡 GitHub branch protection]:
  • check-success = build
  • check-neutral = build
  • check-skipped = build

[mergify]

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).

[github-actions]

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