Update `dotnet 5` references to `dotnet 6`

Expected Behavior

.NET 6 to be referenced exclusively.

.NET 5 hit end of support back in May…

Actual Behavior

Various 5 references sprinkled

grep -ri 'NET 5'
Tests/bin/Debug/Python/PandasTests/PandasMapperTests.py:# Tell PythonNet to use .dotnet 5
Tests/Python/PandasTests/PandasMapperTests.py:# Tell PythonNet to use .dotnet 5
.vs/readme.md:1. Install [.Net 5](https://dotnet.microsoft.com/download) for the project
readme.md:- Install [dotnet 5](https://docs.microsoft.com/en-us/dotnet/core/install/linux):
DockerfileLeanFoundationARM:# Install dotnet 5 sdk & runtime
.vscode/readme.md:1. Install [.Net 5](https://dotnet.microsoft.com/download) for the project
.vscode/launch.json:        Builds the project with dotnet 5 and then launches the program using coreclr; supports debugging.
.vscode/launch.json:        In order to use this you need dotnet 5 on your system path, As well as the C# extension from the 

Potential Solution

Happy to send a PR updating these…

Can someone with more historical knowledge of Lean confirm that there are no reasons that certain platforms or code pieces should still reference v5?

Builds just fine for me on Ubuntu with dotnet 6; haven’t tried other platforms.

Checklist

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[Martin-Molinero]

Hey @ryanrussell! Believe we are good and those do not need to be updated 👍 that’s a library lean depends on

[ryanrussell]

Hey @Martin-Molinero –

Updated the easy ones.

Can you advise on the lib/net5.0 replacements?

If those are as simple as a string replace, I’m happy to do it.

If it needs more thorough debugging, help will be needed to update these and ensure they are correct 😃