Fix handling of ErlangError when :general key is chardata

Close #14322 https://github.com/erlang/otp/blob/57cee857031cc08a47c7d2f4f21a6fac87781f91/lib/public_key/src/pubkey_os_cacerts.erl#L300

Author: sabiwara

lib/elixir/lib/exception.ex

@@ -2718,7 +2718,7 @@ defmodule ErlangError do
  {:ok, reason, IO.iodata_to_binary([":\n\n" | Enum.map(args_errors, &arg_error/1)])}
 
  general = extra[:general] ->
- {:ok, reason, ": " <> general}
+ {:ok, reason, ": " <> IO.chardata_to_string(general)}
 
  true ->
  :error

lib/elixir/test/elixir/exception_test.exs

@@ -50,6 +50,19 @@ defmodule ExceptionTest do
  {:io, :put_chars, [self(), <<222>>],
  [error_info: %{module: __MODULE__, function: :dummy_error_extras}]}
  ])
+
+ assert %ErlangError{
+ original: {:failed_load_cacerts, :enoent},
+ reason: ": Failed to load cacerts: operating system CA bundle could not be located"
+ } =
+ Exception.normalize(:error, {:failed_load_cacerts, :enoent}, [
+ {:pubkey_os_cacerts, :get, 0,
+ [
+ file: ~c"pubkey_os_cacerts.erl",
+ line: 53,
+ error_info: %{cause: :enoent, module: :pubkey_os_cacerts}
+ ]}
+ ])
  end
 
  test "format/2 without stacktrace" do