Setting version of chart to latest doesn't work

[AndyBurdett]

An issue was raised App Forward Versioning #712
A fix was applied but it doesn't work.
I'm no expert but line 58 of helmsman/internal/app/helm_helpers.go fails.
The constraint check doesn't allow for versions of latest.

the desired state file

cesa-futures-web:
    namespace: mynamespace
    enabled: true
    chart: nginx/nginx
    version: "latest"
    valuesFiles:
      - values/nginx.yaml

results in the following

 _          _ 
| |        | | 
| |__   ___| |_ __ ___  ___ _ __ ___   __ _ _ __
| '_ \ / _ \ | '_ ` _ \/ __| '_ ` _ \ / _` | '_ \ 
| | | |  __/ | | | | | \__ \ | | | | | (_| | | | | 
|_| |_|\___|_|_| |_| |_|___/_| |_| |_|\__,_|_| |_| version: v3.17.1
A Helm-Charts-as-Code tool.
2024-10-23 12:48:46 INFO: Parsed [[ tenant-asas-dev.yaml ]] successfully and found [ 2 ] apps
2024-10-23 12:48:46 INFO: Validating desired state definition
2024-10-23 12:48:46 INFO: Setting up kubectl
2024-10-23 12:48:46 INFO: Setting up helm
2024-10-23 12:48:48 INFO: Getting chart information
2024-10-23 12:48:48 ERROR: improper constraint: latest
2024-10-23 12:48:48 CRITICAL: chart validation failed