Update to dot NET SDK 2.2
Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/56893
See https://blogs.msdn.microsoft.com/dotnet/2018/12/04/announcing-net-core-2-2/
It includes diagnostic improvements to the runtime, support for ARM32 for Windows and Azure Active Directory for SQL Client. The biggest improvements in this release are in ASP.NET Core.
TODO
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Update changelog
Edited by Fabien Catteau