Upgrade windows & mac agents per AzDO removing older support

[mydiemho]

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[sonarcloud]

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[pjlittle]

Thanks for addressing this. I'm not sure we would necessarily want to specify 'latest' for images, but given that we're using specific versions like windows-2019 what's a good strategy for keeping these up-to-date? Seems like it will inevitable break at some point. Is there anything else we can do?

[mydiemho]

Thanks for addressing this. I'm not sure we would necessarily want to specify 'latest' for images, but given that we're using specific versions like windows-2019 what's a good strategy for keeping these up-to-date? Seems like it will inevitable break at some point. Is there anything else we can do?

There isn't really a way to keep them up-to-date per se. We just have to check in periodically.

Fortunately, AzDO has also been really good about sending emails about non-backward compatible deprecation. For example, they block all pipelines with old agents from running so we know this has to be updated.