NetCoreForce.Client ForceClient is using UsernamePasswordAsync which has been disabled since Summer '23

[jmil466]

Similar to this issue raised here #88

Salesforce no longer supports Username Password flows for External Client Applications. The ForceClient only allows login via Username Password. Would be great to have this updated to use ClientCredentialsAsync, rather than having to manage this through a separate AuthenticationClient instance.

[anthonyreilly]

I'm planning a release in March, I will try to have this included since it's been requested multiple times now