Remove requirement of a DotNet SDK

Hello,
according to the readme of this project the requirement should include a dotnet runtime not a dotnet SDK.
The following lines check for the installation of a full SDK rather than a runtime

artifacts-keyring/src/artifacts_keyring/plugin.py

Line 37 in a517577

    
           subprocess.check_output(["dotnet", "--version"]).decode().strip().partition("-")[0].split("."))

According to this issue the proper command should be

dotnet --info

and not

dotnet --version

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