Log Message:
py-keyright: updated to 21.2.1

v21.2.1
-------
* Restored lenience on startup when entry point
  metadata is missing.
* Avoid RecursionError when initializing backends
  when a limit is supplied.

v21.2.0
-------
* Chainer now deterministically resolves at a lower
  priority than the Fail keyring (when there are no backends
  to chain).
* Fail keyring now raises a ``NoKeyringError`` for
  easier selectability.
* Keyring now logs at DEBUG rather than INFO during
  backend startup.

v21.1.1
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* Refreshed package metadata.

v21.1.0
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* In SecretService backend, close connections after
  using them.

v21.0.0
-------
* Require Python 3.6 or later.

v20.0.1
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* Fix TypeError when backend fails to initialize.

v20.0.0
-------
* Extracted ``keyring.testing`` package to contain supporting
  functionality for plugin backends. ``keyring.tests`` has been
  removed from the package.

v19.3.0
-------
* Switch to `importlib.metadata
  <https://docs.python.org/3/library/importlib.metadata.html>`_
  for loading entry points. Removes one dependency on Python 3.8.
* Added new ``KeyringBackend.set_properties_from_env``.
* Add support for alternate persistence scopes for Windows
  backend. Set ``.persist`` to "local machine" or "session"
  to enable the alternate scopes or "enterprise" to use the
  default scope.
* Improve import times when a backend is specifically
  configured by lazily calling ``get_all_keyring``.