chore(opensearchservice): add new OpenSearch version 2.19

[Tietew]

Issue # (if applicable)

N/A

Reason for this change

OpenSearch version 2.19 is available.
https://aws.amazon.com/about-aws/whats-new/2025/04/amazon-opensearch-service-opensearch-version-2-19/

Description of changes

Added an enum EngineVersion.OPENSEARCH_2_19

Describe any new or updated permissions being added

N/A

Description of how you validated changes

Added the enum to unit tests.

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

[paulhcsun]

@Mergifyio update

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update

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[paulhcsun]

@Mergifyio update

[mergify]

update

❌ Mergify doesn't have permission to update

For security reasons, Mergify can't update this pull request. Try updating locally.
GitHub response: refusing to allow a GitHub App to create or update workflow .github/workflows/security-guardian.yml without workflows permission

Pull request has been modified.

[paulhcsun]

@Mergifyio update

[mergify]

update

✅ Branch has been successfully updated

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: b8b9dea
• Result: SUCCEEDED
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