[bug] Member must have length less than or equal to 2048

I started seeing this error:

```
2024/06/29 02:12:51 ValidationException: 1 validation error detected: Value '[]' at 'layers' failed to satisfy constraint: Member must satisfy constraint: [Member must have length less than or equal to 2048, Member must have length greater than or equal to 1, Member must satisfy regular expression pattern: (arn:(aws[a-zA-Z-]*)?:lambda:[a-z]{2}((-gov)|(-iso([a-z]?)))?-[a-z]+-\d{1}:\d{12}:layer:[a-zA-Z0-9-_]+:[0-9]+)|(arn:[a-zA-Z0-9-]+:lambda:::awslayer:[a-zA-Z0-9-_]+), Member must not be null]
```

Not sure what changed

No source files, tests, or entry points are identified in the report. Start by reproducing the GitHub Action deployment with the reported AWS Lambda validation error and trace how the layers input is constructed; done means identifying the changed behavior and confirming a deployment no longer sends an invalid layers value.

Written by the indexing model from the issue text.