Azure Pipelines: windows-2016 is deprecated

[Geod24]

actions/runner-images#4312

Already visible in Azure Pipelines:

##[warning]The windows-2016 environment will be deprecated on November 15, 2021, and removed on March 15, 2022. Migrate to windows-latest instead. For more details see actions/runner-images#4312

Brownouts:

December 1, 2021 4:00pm UTC – 10:00pm UTC
February 7, 2022 4:00pm UTC – 10:00pm UTC

[MoonlightSentinel]

The deprecated image can be replaced with windows2019, which also switches to Visual Studio 2019:

• Azure: Replace deprecated vs2017-win2016 image with windows-2019 #13482
• Azure: Replace deprecated vs2017-win2016 image with windows-2019 druntime#3660
• Azure: Replace deprecated vs2017-win2016 image with windows-2019 phobos#8348

[PetarKirov]

@Geod24 pls force merge #13482

[Geod24]

Thanks for taking care of this!