Remove :preferred_cli_env deprecation in Elixir v1.19

Author: san650

mix.exs

@@ -28,14 +28,7 @@ defmodule PolymorphicEmbed.MixProject do
       ],
 
       # ExCoveralls
-      test_coverage: [tool: ExCoveralls],
-      preferred_cli_env: [
-        coveralls: :test,
-        "coveralls.detail": :test,
-        "coveralls.post": :test,
-        "coveralls.html": :test,
-        "coveralls.github": :test
-      ]
+      test_coverage: [tool: ExCoveralls]
     ]
   end
 
@@ -45,6 +38,18 @@ defmodule PolymorphicEmbed.MixProject do
     ]
   end
 
+  def cli do
+    [
+      preferred_envs: [
+        coveralls: :test,
+        "coveralls.detail": :test,
+        "coveralls.post": :test,
+        "coveralls.html": :test,
+        "coveralls.github": :test
+      ]
+    ]
+  end
+
   defp deps do
     [
       {:ecto, "~> 3.12"},