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That's a bit weird.. azure-native is continuously (and afaik automatically) updated with latest ARM spec - check: <https://github.com/pulumi/pulumi-azure-native/blob/master/CHANGELOG.md>
That being said - it is weird that 2019-10-01 is not in place:
<https://docs.microsoft.com/en-us/azure/templates/microsoft.machinelearning/2019-10-01/workspaces?tabs=json>

Our versioning is outlined here: <https://www.pulumi.com/docs/intro/cloud-providers/azure/version-guide/>

I will double-check what’s going on with that specific resource and will respond in the issue