NLUTest target framework failing in Azure pipeline using windows agent

[yeniercastaneda]

I'm using the NLUTest task in Azure pipeline with window latest agent version, recently the task start giving this error

Tool 'dotnet-nlu' (version '0.8.1') was successfully installed.
"C:\hostedtoolcache\windows\dotnet\dotnet.exe" nlu test -s luisV3 -u luis-app/tests/unittests.json -o D:\a_temp/results.json -v
It was not possible to find any compatible framework version
The framework 'Microsoft.NETCore.App', version '2.1.0' was not found.

I can install the .Net SDK version 2.x and this will work, but I want to know it will be possible to update the project target framework to a more updated version.

[jorgegarcia93]

@yeniercastaneda this Pull Request upgrades the target framework to use dotnet core 3.1