Log Message:
notmuch: Update to 0.34.3

Changelog:
What's new in notmuch 0.34.3
=========================

Library
-------

Do not crash when presented with a .notmuch directory without a
xapian/ subdirectory.

Python Bindings (notmuch2)
--------------------------

Database constructor now searches for configuration by default. Pass
`config=Database.CONFIG.EMPTY` to disable.

The `Message.replies()` method now returns OwnedMessage objects, to
prevent certain memory de-allocation errors.

Fix for importing `notmuch2` module when building bindings
documentation.