[erchef] Upgrade chef_authn
[erchef] Upgrade chef_authn

This pulls in two fixes:

- Handle decoded keys from the keyring in signing mode 1.3 (hopefully
fixes FIPS)

- Cleans up some leftover log statements

Signed-off-by: Steven Danna <9ce5770b3bb4b2a1d59be2d97e34379cd192299f@chef.io>

chef/chef-server,chef/chef-server,chef/chef-server,chef/chef-server,chef/chef-server,chef/chef-server