Update to latest Asp.Versioning package versions

It looks like this is a recent change in the latest Asp.Versioning package:

https://github.com/dotnet/aspnet-api-versioning/releases/tag/v10.0.0

OpenAPI documents use "enum": ["1.0"] instead of "default": "1.0"

We have a transformer that repaced default with example. We should just update that to remove enum and add example.

Originally posted by @mikekistler in #985