Draft: Update dependency graphviz to v0.20.1

This MR contains the following updates:

Package	Update	Change
graphviz (changelog)	patch	==0.20 -> ==0.20.1

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Release Notes

xflr6/graphviz

v0.20.1

Compare Source

Fix documentation building: upgrade to Sphinx 5.0.

Fix broken user guide links in API documentation.

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