py-pygraphviz: updated to 1.13

pygraphviz 1.13
===============

We're happy to announce the release of pygraphviz 1.13!

Bug Fixes
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- Remove outdated pystrings.swg
- Fix segfault from repr attempting to access attrs on uninitialized instance

Maintenance
-----------

- Remove outdated pystrings.swg
- Update CI tests
- Update pre-commit repos
- Bump webfactory/ssh-agent from 0.8.0 to 0.9.0
- Update tests for macOS Sonoma v14
- Update doc requirements
- Update pre-commit repos
- Remove unnecessary pip flags
- Test on fedora 40

(adam)