Leather

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* feat: :meth:`.Chart.add_line` accepts a `stroke_dasharray argument <https://developer.mozilla.org/en-US/docs/Web/SVG/Attribute/stroke-dasharray>`_.
* feat: Add a ``default_stroke_dasharray`` theme option.
* fix: Apply the ``axis_title_font_size`` and ``tick_font_size`` theme options.

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* Leather no longer reconfigures Python warnings globally.
* Add Python 3.11 and 3.12 support.
* Drop Python 3.7 support (end-of-life was June 27, 2023).

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* Add Python 3.10 support.

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* Fix examples that used invalid column data. (81)
* lxml is no longer imported by default. (83)
* Ordinal scales can now display data from multiple series with different values. (76)
* Better error handling for data types supported by different shapes.

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* Fix trove classifiers.

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* Fix unicode rendering issue in Python2.7 and PyPy. (74)