Windows installer hard coded to a version

[bhelx]

The bash installer first looks at the releases then gets the most up to date version. The powershell installer is hard coded: https://github.com/extism/js-pdk/blob/05cecf212dd5be1db8a6633dceda4c070b8b92d1/install-windows.ps1#L3

The task of this issue would be to implement the same logic that the bash installer does in the ps script.