add windows support to stripe-mock action

[xavdid]

Why?

We're adding platform-specific logic to the SDKs, so we're also adding a windows test. Our stripe-mock action didn't support windows

The logic is pulled from the .NET CI, which did have a windows test. So I have pretty high confidence in it: stripe/stripe-dotnet | ci.yml#L171-L186

What?

• add a windows path for the stripe-mock action
• prettier changed some quotes

See Also

• Replace source hash with Telemetry UUID stripe-dotnet#3409

[jar-stripe]

For posterity, we do that in .NET CI because you can't run linux containers on a windows runner in GHA: https://github.com/orgs/community/discussions/25491. If that ever changes (i.e. if we put out a windows image for stripe-mock or GH supports running linux containers on windows) we could change this back to always using a docker image.