client: remove deprecated IsErrUnauthorized, IsErrNotImplemented
client: remove deprecated IsErrUnauthorized, IsErrNotImplemented

These were deprecated in ee230d8fdda6a1901c2adc394b5fb8471ec7aa51,
which is in the 22.06 branch, so we can safely remove it from
master to have them removed in the release after that.

Signed-off-by: Sebastiaan van Stijn <64b2b6d12bfe4baae7dad3d018f8cbf6b0e7a044@gone.nl>

trebonian/docker,trebonian/docker,thaJeztah/docker,jimjag/docker,mahak/docker,thaJeztah/docker,trebonian/docker,moby/moby,cpuguy83/docker,thaJeztah/docker,Mokolea/docker,Ramzec/docker,Mokolea/docker,moby/moby,moul/docker,Ramzec/docker,jimjag/docker,mahak/docker,cpuguy83/docker,konstruktoid/docker-upstream,jimjag/docker,konstruktoid/docker-upstream,Mokolea/docker,moul/docker,mahak/docker,Ramzec/docker,cpuguy83/docker,moul/docker,konstruktoid/docker-upstream,cpuguy83/docker,Mokolea/docker,trebonian/docker,Ramzec/docker,jimjag/docker,mahak/docker,moby/moby,moby/moby,konstruktoid/docker-upstream,thaJeztah/docker,moul/docker