Remove Failure output type

Author: mortenpi

src/PkgAuthentication.jl

@@ -184,7 +184,7 @@ struct NeedRefresh <: State
     server::String
     token::Dict{String, Any}
 end
-function step(state::NeedRefresh)::Union{HasNewToken, NoAuthentication, Failure}
+function step(state::NeedRefresh)::Union{HasNewToken, NoAuthentication}
     refresh_token = state.token["refresh_token"]
     headers = ["Authorization" => "Bearer $refresh_token"]
     output = IOBuffer()