Fix downloading updates for packages with non-ASCII descriptions
* lisp/emacs-lisp/package.el (package--download-one-archive): Make sure archive contents are written using UTF-8 encoding. (Bug#34909) (list-packages): Set buffer's encoding to UTF-8.
* lisp/emacs-lisp/package.el (package--download-one-archive): Make sure archive contents are written using UTF-8 encoding. (Bug#34909) (list-packages): Set buffer's encoding to UTF-8.