Keyring

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* 448: ``SecretService`` and ``libsecret`` backends now support a
new ``SelectableScheme``, allowing the keys for "username" and
"service" to be overridden for compatibility with other schemes
such as KeePassXC.

* Introduced a new ``.with_properties`` method on backends to
produce a new keyring with different properties. Use for example
to get a keyring with a different ``keychain`` (macOS) or
``scheme`` (SecretService/libsecret). e.g.::

keypass = keyring.get_keyring().with_properties(scheme='KeePassXC')

* ``.with_keychain`` method on macOS is superseded by ``.with_properties``
and so is now deprecated.

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* 582: Suppress KeyringErrors for devpi client.

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* 575: Only require ``importlib_metadata`` on older Pythons.
* 579: Add ``.with_keychain`` method on macOS for easy reference
to alternate keychains.

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* The correct config root is now used on Windows.

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* Require Python 3.7 or later.

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* 551: Fixed docs warnings.