Bump graphviz from 0.20.1 to 0.20.2

[dependabot[bot]]

Bumps graphviz from 0.20.1 to 0.20.2.

Changelog

Sourced from graphviz's changelog.

Version 0.20.2

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.

Commits

• 34fb16b release 0.20.2
• 7fab480 ignore own signature-related deprecation warnings in release process
• 09e2161 run update-help.py with Python 3.12
• 24507fc document excluded pytest 8.1.1 version
• 7fb9191 fix inline literal start-string without end-string
• f1a9f8d work around pytest import file mismatch error
• f586034 move update-help to Python 3.11
• b5827bd run update-help.py for 8cddcf125e55216097375de03d0e969af80cd81d
• c638217 document latest changes
• 8cddcf1 add caveat about label escaping/quoting to .node() and .render() API docs
• Additional commits viewable in compare view

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