Log Message:
py-aiohttp: updated to 3.7.1

3.7.1

Bugfixes
- Fixed a type error caused by the conditional import of `Protocol`.
- Server doesn't send Content-Length for 1xx or 204
- Fix run_app typing
- Always require ``typing_extensions`` library.
- Fix a variable-shadowing bug causing `ThreadedResolver.resolve` to
  return the resolved IP as the ``hostname`` in each record, which prevented
  validation of HTTPS connections.
- Added annotations to all public attributes.
- Fix flaky test_when_timeout_smaller_second
- Ensure sending a zero byte file does not throw an exception
- Fix a bug in ``web.run_app()`` about Python version checking on Windows