Template testing CI action doesn't work on Windows

[pepone]

We have a CI action to test templates in https://github.com/icerpc/icerpc-csharp/blob/99a76dcf00f241723cf8256cc9559e08ca96715f/.github/actions/test-templates/action.yaml#L1

This action uses bash and cannot be used by the release workflow on Windows machines. We should either fix this action, or add a similar action for windows and update the release workflow to use it on Windows.