The builds fail due to server-2014 decommissioning

[zbalkan]

The Azure pipeline is broken due to server-2016 decommissioning, see ref: https://github.com/actions/virtual-environments/issues/5238

Below you can find the error text.

##[error]This is a scheduled windows-2016 brownout. The windows-2016 environment is deprecated and will be removed on April 1st, 2022. For more details, see https://github.com/actions/virtual-environments/issues/5238
,##[error]The remote provider was unable to process the request.

The pipeline needs to use at least server-2019 in current case.