Extract Tailwind release helpers

lib/mix/tasks/tailwind/check_version.ex

@@ -8,19 +8,12 @@ defmodule Mix.Tasks.Tailwind.CheckVersion do
   Exits with 0 if versions match, 1 if the Tailwind needs to be updated.
   """
 
+  alias Mix.Tasks.Tailwind.Release
+
   @impl Mix.Task
   def run(_args) do
-    Application.ensure_all_started(:req)
-
-    current_version =
-      Application.get_env(:tailwind, :version)
-
-    latest_version_url =
-      "https://api.github.com/repos/tailwindlabs/tailwindcss/releases/latest"
-
-    latest_version =
-      Req.get!(latest_version_url).body["tag_name"]
-      |> String.replace_prefix("v", "")
+    current_version = Release.fetch_current_version()
+    latest_version = Release.fetch_latest_version!()
 
     if current_version !== latest_version do
       Mix.Shell.IO.info(