V4.0 Change C# version from 9 to 12. Remove .NET Standard targets #360
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What?
Removes targets for .NET Standard 2.0 and .NET Standard 2.1. Update to C# 12.
Why?
Allow for using default interface methods as part of C# 8 to evolve the API over time. .NET Framework does not support this feature so to allow use of default interface methods we should drop .NET Standard 2.0.
Removing .NET Standard 2.1 allows for C# 10 and .NET Standard 2.1 only is used for .NET Core, which is out of support.