Please upgrade to .NET 6.0

[fiddyschmitt]

Thanks for the great project! Could you please convert it to use .NET 6.0?

I've tried using Microsoft's Upgrade Assistant, however it doesn't work as reported here.

Thank you!

[fiddyschmitt]

The upgrade is possible if you first comment out the following line in the csproj:

<!--<Import Project="$(SolutionDir)\.nuget\nuget.targets" />-->

Then run the upgrade command:

upgrade-assistant upgrade "WebDAVSharp.Server.csproj"