Resolve Dialyzer errors on Elixir 1.16

closes #642

Author: nathany-copia

lib/tesla/multipart.ex

@@ -103,7 +103,7 @@ defmodule Tesla.Multipart do
         false -> headers
       end
 
-    data = File.stream!(path, [], 2048)
+    data = File.stream!(path, 2048)
     add_file_content(mp, data, filename, opts ++ [headers: headers])
   end
 

mix.exs

@@ -10,7 +10,7 @@ defmodule Tesla.Mixfile do
       version: @version,
       description: description(),
       package: package(),
-      elixir: "~> 1.10",
+      elixir: "~> 1.16",
       elixirc_paths: elixirc_paths(Mix.env()),
       deps: deps(),
       lockfile: lockfile(System.get_env("LOCKFILE")),