Log Message:
py-graphviz: updated to 0.17

Version 0.17
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Drop Python 2 support. Tag Python 3.10 support.

Migrate CI to GitHub actions. Add ``pypy3`` to matrix.

Tests: implement ``--skip-exe`` via custom ``pytest`` marker.

Documentation: point Anaconda users to ``conda-forge/python-graphviz``.

Move type hints from docstrings to type annotations. Improve doctests.

Examples: standardize import convention and modernize.

Re-render example notebooks with Graphviz 2.46.1.