fix: force_encoding for file data

Author: rdimartino

lib/httparty/request/body.rb

@@ -83,6 +83,7 @@ def normalize_query(query)
       def content_body(object)
         if file?(object)
           object = (file = object).read
+          object.force_encoding(Encoding::UTF_8) if object.respond_to?(:force_encoding)
           file.rewind if file.respond_to?(:rewind)
         end