Draft: Update dependency graphviz to v0.20.3

This MR contains the following updates:

Package	Update	Change
graphviz (changelog)	patch	==0.20 -> ==0.20.3

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Release Notes

xflr6/graphviz (graphviz)

v0.20.3

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Revert improvements to the internal tools.deprecate_positional_args() decorator that caused false positive PendingDeprecationWarning: The signature of ... will be reduced warnings that have been misinterpreted in the 0.20.2 release process.

v0.20.2

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Drop Python 3.7 support (end of life 27 Jun 2023).

Tag Python 3.11 and 3.12 support.

Add caveat about labe escaping/quoting to .node() and .render() API docs.

Document that doctest_skip_exe() lines in doctest should be ignored.

Improve internal tools.deprecate_positional_args() decorator and fix incorect test assertion.

Update GitHub actions.

Pin pytest test dependency to <8.1 as a workaround for import file mismatch error related to conftest.py files, in pytest 8.1.1, see https://github.com/pytest-dev/pytest/issues/12123.

v0.20.1

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Fix documentation building: upgrade to Sphinx 5.0.

Fix broken user guide links in API documentation.

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