chore(Elixir): Fix warnings emitted by elixir 1.16 (#38)

* chore(Elixir): Fix warnings emitted by elixir 1.16

* Fix additional warnings.

---------

Co-authored-by: Benjamin Schultzer <benjamin@schultzer.com>

config/config.exs

@@ -1,2 +1,2 @@
 import Config
-import_config "#{Mix.env}.exs"
+import_config "#{Mix.env()}.exs"

lib/cldr/backend.ex

@@ -180,7 +180,7 @@ defmodule Cldr.Territory.Backend do
         def known_territory_subdivisions(territory_code) do
           case Cldr.validate_territory(territory_code) do
             {:error, reason}      -> {:error, reason}
-            {:ok, territory_code} -> {:ok, Cldr.known_territory_subdivisions[territory_code]}
+            {:ok, territory_code} -> {:ok, Cldr.known_territory_subdivisions()[territory_code]}
           end
         end
 
@@ -224,7 +224,7 @@ defmodule Cldr.Territory.Backend do
         @spec from_territory_code(atom() | String.t() | LanguageTag.t(), Keyword.t()) :: {:ok, String.t()} | {:error, {module(), String.t()}}
         def from_territory_code(territory_code, options \\ []) do
           with {:ok, code} <- Cldr.validate_territory(territory_code),
-               {:ok, local} <- Cldr.validate_locale(Keyword.get(options, :locale, Cldr.get_locale), unquote(backend)) do
+               {:ok, local} <- Cldr.validate_locale(Keyword.get(options, :locale, Cldr.get_locale()), unquote(backend)) do
             from_territory_code(code, local.cldr_locale_name, Keyword.get(options, :style, :standard))
           else
             error -> error

mix.exs

@@ -13,7 +13,7 @@ defmodule Cldr.Territories.Mixfile do
       description: description(),
       package: package(),
       docs: docs(),
-      start_permanent: Mix.env == :prod,
+      start_permanent: Mix.env() == :prod,
       deps: deps(),
       elixirc_paths: elixirc_paths(Mix.env()),
       cldr_provider: {Cldr.Territory.Backend, :define_territory_module, []},