Bump presignup lambda to node v20 from 18

[KyleOps]

Pull Request Template

Description

Upgrade the presignup lambda Node.js runtime from v18 to v20 in Terraform configuration. This change keeps the lambda function up-to-date with the latest supported Node.js LTS version, ensuring better performance, security patches, and continued AWS support.

The change updates the runtime parameter in the aws_lambda_function.pre_signup resource from nodejs18.x to nodejs20.x.

Fixes # (issue)

Type of change

Please delete options that are not relevant.

• Breaking change (fix or feature that would cause existing functionality to not work as expected)

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• Static analysis of Node.js code performed to verify Node.js 20 compatibility
• Deployed to dev environment for runtime testing

Testing Notes: Static analysis has been completed and shows no compatibility issues with Node.js 20. Deployment to dev environment is pending for full runtime verification.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• New and existing tests pass with my changes

Additionally incorporates the changes from IHTSDO#176

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud