- update to 3.9.5:
  * Fixed "Unclosed client session" when initialization of
    :py:class:`~aiohttp.ClientSession` fails
  * Fixed regression (from :pr:`8280`) with adding Content-
    Disposition to the form-data part after appending to writer
  * Added default Content-Disposition in multipart/form-data
    responses to avoid broken form-data responses
  * The asynchronous internals now set the underlying causes when
    assigning exceptions to the future objects
  * Treated values of Accept-Encoding header as case-insensitive
    when checking for gzip files
  * Improved the DNS resolution performance on cache hit
  * Changed the type annotations to allow dict on
    :meth:`aiohttp.MultipartWriter.append`,
    :meth:`aiohttp.MultipartWriter.append_json` and
    :meth:`aiohttp.MultipartWriter.append_form` -- by
    :user:`cakemanny` Related issues and pull requests on GitHub:
    :issue:`7741`.
  * Ensure websocket transport is closed when client does not
    close it
  * Leave websocket transport open if receive times out or is
    cancelled
  * Fixed content not being read when an upgrade request was not
    supported with the pure Python implementation.
  * Fixed a race condition with incoming connections during
    server shutdown
  * Fixed multipart/form-data compliance with RFC 7578
  * Fixed blocking I/O in the event loop while processing files
    in a POST request
  * Escaped filenames in static view

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