CI: tweak the vm images we use on azure #16605
Merged
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This is prompted by the osx image we were using being deprecated [1].
Looking at [2] to update the osx images, found we are now a version
behind on both win and linux as well. Change so that the newer python
versions run on newer images.
[1] https://devblogs.microsoft.com/devops/removing-older-images-in-azure-pipelines-hosted-pools/
[2] https://docs.microsoft.com/en-us/azure/devops/pipelines/agents/hosted?view=azure-devops
Need to backport this or CI will start failing on 3.2.x