Use Dotnet5 when building for pushing to Nuget

AssemblyAbstractions has LoadFrom constructor

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WIP:Try [Collection("Sequential")]

0.2.1:Adapt test to new version

Change test dotnet version to 3.1

This commit lessens the version of the test project to make it work in github workflow.

Correct project name in csp and update version to 0.1.1

Correct project name in csp and update version to 0.1.1