Fails to build: nodejs12.x is no longer supported

[AllenEllis]

Hi, thanks for this project!

Trying to deploy it from the Serverless Application Repository seems to fail each time, causing a rollback. When I click to view the stack in CloudFormation, I see the following error:

SubmitFormFunction
CREATE_FAILED
Resource handler returned message: "The runtime parameter of nodejs12.x is no longer supported for creating or updating AWS Lambda functions. We recommend you use the new runtime (nodejs18.x) while creating or updating functions.

I'm not sure how to debug further, as I don't see a way to modify the template before deploying. I'll try creating a new project and see if I can modify that to get it to work.