Fix passing of File.cp_r! on_conflict option (#12015)

Author: michallepicki

lib/mix/lib/mix/release.ex

@@ -773,7 +773,7 @@ defmodule Mix.Release do
 
     release.erts_source
     |> Path.join("bin")
-    |> File.cp_r!(destination, fn _, _ -> false end)
+    |> File.cp_r!(destination, on_conflict: fn _, _ -> false end)
 
     _ = File.rm(Path.join(destination, "erl"))
     _ = File.rm(Path.join(destination, "erl.ini"))

lib/mix/lib/mix/utils.ex

@@ -518,11 +518,13 @@ defmodule Mix.Utils do
 
       {:error, _} ->
         files =
-          File.cp_r!(source, target, fn orig, dest ->
-            {orig_mtime, orig_size} = last_modified_and_size(orig)
-            {dest_mtime, dest_size} = last_modified_and_size(dest)
-            orig_mtime > dest_mtime or orig_size != dest_size
-          end)
+          File.cp_r!(source, target,
+            on_conflict: fn orig, dest ->
+              {orig_mtime, orig_size} = last_modified_and_size(orig)
+              {dest_mtime, dest_size} = last_modified_and_size(dest)
+              orig_mtime > dest_mtime or orig_size != dest_size
+            end
+          )
 
         {:ok, files}
     end