Bump microsoft.aspnetcore.app from 2.1.4 to 2.1.15 in /src/Tests/Web.Api.UnitTests#6

dependabot[bot] wants to merge 1 commit intomastermmacneil/CleanAspNetCoreWebApi:masterfrom

dependabot/nuget/src/Tests/Web.Api.UnitTests/microsoft.aspnetcore.app-2.1.15mmacneil/CleanAspNetCoreWebApi:dependabot/nuget/src/Tests/Web.Api.UnitTests/microsoft.aspnetcore.app-2.1.15Copy head branch name to clipboard