Log Message:
py-h2: updatd to 4.1.0

4.1.0 (2021-10-05)
------------------
API Changes (Backward-Compatible)
- Support for Python 3.9 has been added.
- Support for Python 3.10 has been added.
- New example for a Python socket HTTP/2 client.
- New `OutputLogger` for use with ``h2.config.logger``. This is only provided
  for convenience and not part of the stable API.

Bugfixes
- Header validation now rejects empty header names with a ProtocolError. While
  hpack decodes such header blocks without issues, they violate the
  HTTP semantics.
- Fix TE header name in error message.