Todoman

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* The ``PRODID`` for new entries has changed ``io.barrera.todoman`` to
``nl.whynothugo.todoman``. This has no functional impact, but may be relevant
when debugging the origin of specific files.
* Drop ``sphinx-autorun`` dependency for the docs as it has been unused for some
time now anyway.
* Add a new ``path`` command which prints the full file path to a task.
* Show a clearer error when ``click-repl`` is missing.
* Drop usage of ``pytz``. This was previously a transitive dependency via
``icalendar``.

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* Add support for Python 3.12. Todoman already worked with Python 3.12, but is
now tested with this Python version in CI and has the relevant classifiers.
* Fix crash when trying to use Python 3.9.

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* Fix filtering for non-ASCII categories.

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* Identical to v4.3.0, which was not properly published to PyPI.

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* Add support for Python 3.11. Todoman already worked with Python 3.11, but is
now tested with this Python version in CI and has the relevant classifiers.
* Improved zsh shell completion.
* Dropped ``setup.py`` in favour of ``pyproject.toml``.

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* Added full support for categories.