Package management and project file updates

[tang2087]

• Update nuget packages to the latest version
• Update project files to use SDK for tools to remove the following warnings when build.

C:\Program Files\dotnet\sdk\2.1.300\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.ObsoleteReferences.targets(33,5): Warning : The tool 'Microsoft.EntityFrameworkCore.Tools.DotNet' is now included in the .NET Core SDK. Information on resolving this warning is available at (https://aka.ms/dotnetclitools-in-box). C:\Program Files\dotnet\sdk\2.1.300\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.ObsoleteReferences.targets(33,5): Warning : The tool 'Microsoft.Extensions.SecretManager.Tools' is now included in the .NET Core SDK. Information on resolving this warning is available at (https://aka.ms/dotnetclitools-in-box). C:\Program Files\dotnet\sdk\2.1.300\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.ObsoleteReferences.targets(33,5): Warning : The tool 'Microsoft.EntityFrameworkCore.Tools.DotNet' is now included in the .NET Core SDK. Information on resolving this warning is available at (https://aka.ms/dotnetclitools-in-box). C:\Program Files\dotnet\sdk\2.1.300\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.ObsoleteReferences.targets(33,5): Warning : The tool 'Microsoft.Extensions.SecretManager.Tools' is now included in the .NET Core SDK. Information on resolving this warning is available at (https://aka.ms/dotnetclitools-in-box). src\Kontext.Docu.Web.Portals\Startup.cs(79,106): Warning CS1998: This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread. src\Kontext.Docu.Web.Portals\Areas\BlogAdminArea\Controllers\BlogCategoriesController.cs(184,42): Warning CS1998: This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread. src\Kontext.Docu.Web.Portals\Views\Manage\ChangePassword.cshtml(16,7): Warning MVC1000: Use of IHtmlHelper.Partial may result in application deadlocks. Consider using <partial> Tag Helper or IHtmlHelper.PartialAsync. src\Kontext.Docu.Web.Portals\Views\Manage\DeletePersonalDataConfirmed.cshtml(7,7): Warning MVC1000: Use of IHtmlHelper.Partial may result in application deadlocks. Consider using <partial> Tag Helper or IHtmlHelper.PartialAsync. src\Kontext.Docu.Web.Portals\Views\Manage\ExternalLogins.cshtml(7,7): Warning MVC1000: Use of IHtmlHelper.Partial may result in application deadlocks. Consider using <partial> Tag Helper or IHtmlHelper.PartialAsync. src\Kontext.Docu.Web.Portals\Views\Manage\Index.cshtml(16,7): Warning MVC1000: Use of IHtmlHelper.Partial may result in application deadlocks. Consider using <partial> Tag Helper or IHtmlHelper.PartialAsync. src\Kontext.Docu.Web.Portals\Views\Manage\SetPassword.cshtml(8,7): Warning MVC1000: Use of IHtmlHelper.Partial may result in application deadlocks. Consider using <partial> Tag Helper or IHtmlHelper.PartialAsync.  No test assemblies found matching the pattern: **\release\*test*.dll,!**\obj\**.  Unsupported source provider 'GitHub' for source indexing.  Unable to index sources.