Revert "Go back to an SDK that is actually installed on machines" #10095
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Reverts #10076
Internal validation VMs still don't have 16.7 (and 3.1.401 requires 16.7).
https://dev.azure.com/dnceng/internal/_build/results?buildId=807628&view=logs&j=306272fe-0d8c-58af-8d13-1dae09fcca5c&t=5fb73c2f-2eea-59ef-8241-10ac18d76c2a