Log Message:
py-urllib3: updated to 1.26.6

1.26.6 (2021-06-25)
-------------------
* Deprecated the ``urllib3.contrib.ntlmpool`` module. urllib3 is not able to support
  it properly due to `reasons listed in this issue \ 
<https://github.com/urllib3/urllib3/issues/2282>`_.
  If you are a user of this module please leave a comment.
* Changed ``HTTPConnection.request_chunked()`` to not erroneously emit multiple
  ``Transfer-Encoding`` headers in the case that one is already specified.
* Fixed typo in deprecation message to recommend ``Retry.DEFAULT_ALLOWED_METHODS``.