Bump eol target frameworks

[gitfool]

The following warnings are seen while building Cake with Visual Studio 2019 Preview and the latest SDK:

C:\Program Files\dotnet\sdk\5.0.100-rc.1.20452.10\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.EolTargetFrameworks.targets(28,5): warning NETSDK1138: The target framework 'netcoreapp2.0' is out of support and will not receive security updates in the future. Please refer to https://aka.ms/dotnet-core-support for more information about the support policy.
C:\Program Files\dotnet\sdk\5.0.100-rc.1.20452.10\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.EolTargetFrameworks.targets(28,5): warning NETSDK1138: The target framework 'netcoreapp3.0' is out of support and will not receive security updates in the future. Please refer to https://aka.ms/dotnet-core-support for more information about the support policy.

See .NET Core and .NET 5 Support Policy for more information.

I suggest bumping the following target frameworks:

• netcoreapp2.0 to netcoreapp2.1
• netcoreapp3.0 to netcoreapp3.1
• net46 to net461 (currently inconsistent)

[pascalberger]

Related issue #2253

[devlead]

Note 2.1 is now also EOL

Version	Latest release	Latest release date	End of support
.NET Core 3.0	3.0.3	February 18, 2020	March 03, 2020
.NET Core 2.2	2.2.8	November 19, 2019	December 23, 2019
.NET Core 2.1	2.1.30	August 19, 2021	August 21, 2021
.NET Core 2.0	2.0.9	July 10, 2018	October 01, 2018
.NET Core 1.1	1.1.13	May 14, 2019	June 27, 2019
.NET Core 1.0	1.0.16	May 14, 2019	June 27, 2019

[gitfool]

@devlead do you want me to follow up with another PR removing .NET Core 2.1?

[pascalberger]

@gitfool We'll probably tomorrow publish what TFMs we want to support in 2.0. Once this is out, we'll create the corresponding issues, which we're happy if you want to pick any of it.

[devlead]

@gitfool I have a PR in the works for parts of this in refactoring the build script.
But post that there will be some cleaning and issues to pick from :)

[cake-build-bot]

🎉 This issue has been resolved in version v2.0.0 🎉

The release is available on:

• GitHub Release
• NuGet Package
• Chocolatey Package
• .Net Global Tool

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