Updates dependencies for netcore 3.1 & net5.0

[johnkors]

As pr https://github.com/dotnet/aspnetcore/issues/3756 , Microsoft.AspNetCore.Http has been moved into the shared framework (installed via the runtimes) as of ASP.NET Core 3.0.

This PR makes projects targeting netcoreapp3.1 or net5.0 avoid taking a transient dependency on the older Microsoft.AspNetCore.Http/2.2.2, but use the one newest from the shared framework version instead.

[johnkors]

Note: this fix is only relevant for projects not using the Microsoft.NET.Sdk.Web SDK.

• When doing dotnet publish on a Microsoft.NET.Sdk project targeting net3.1+, the old Microsoft.AspnetCore.Http.dll v2.2.2 is present in the output folder.
• When doing dotnet publish on a Microsoft.NET.SDK project having a FrameworkReference to Microsoft.AspNetCore.App, it won't be in the output folder.
• When doing dotnet publish on a Microsoft.NET.Sdk.Web project it won't be present in the output folder.

The Web SDK implicitly has FrameworkReference to Microsoft.AspNetCore.App, meaning it will disregard the transient dependency from Serilog.Enrichers.CorrelationId, and use the framework version instead.

I guess there's nothing really stopping a non-web project from installing this package, but it's intended use case is around adding logs within a httpcontext. So I see now this PR might not be that relevant.

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[johnkors]

Closing due to lack of interest.