Fix JOSE.JWE.compact/1 @spec

[kpanic]

Hey there 👋🏾 thanks for the fantastic library! 🎉

I figured out that there might be a @spec error when running dialyzer from my app.

The code is more or less this:

jwk
|> JOSE.JWE.block_encrypt(Jason.encode!(payload), %{
  "alg" => @alg,
  "enc" => @enc
})
|> JOSE.JWE.compact()
|> elem(1)

The dialyzer complaint (from my side) is:

The function call will not succeed.
JOSE.JWE.compact({%{:alg => atom(), :enc => atom(), :zip => atom()}, %{<<_::16, _::size(8)>> => binary()}}) ::
  :ok
def a() do
  :ok
end

breaks the contract
(map()) :: {map(), binary()}

PS: I am not sure if {map(), map()} is 100% correct. Please let me know

[potatosalad]

@kpanic Thanks!