Bump Microsoft.NET.Test.Sdk from 16.2.0 to 16.8.3 in /sources/ReleaseServer/ReleaseServer.WebApi.Test#12

dependabot-preview[bot] wants to merge 1 commit intomastertiwalter/release-server:masterfrom

dependabot-nuget-sources-ReleaseServer-ReleaseServer.WebApi.Test-Microsoft.NET.Test.Sdk-16.8.3tiwalter/release-server:dependabot-nuget-sources-ReleaseServer-ReleaseServer.WebApi.Test-Microsoft.NET.Test.Sdk-16.8.3Copy head branch name to clipboard