Update pygraphviz requirement from ~=1.14 to ~=2.0 in the python-packages group

[dependabot]

Updates the requirements on pygraphviz to permit the latest version.
Updates pygraphviz to 2.0

Release notes

Sourced from pygraphviz's releases.

pygraphviz-2.0

pygraphviz 2.0

We're happy to announce the release of pygraphviz 2.0!

Enhancements

• Add aarch64 wheels for linux to cibuildwheel (#591).
• ENH: Export version info from wrapped graphviz (#624).

Bug Fixes

• More precise allocation for string copy in SWIG glue (#559).

Documentation

• Avoid adding benchmark results to docs (#544).
• DOC: remove pip install as recommendation (#551).
• DOC: update install docs with link to graphviz 12.2.1 for windows (#552).
• Update docs for 2.0 (#609).
• DOC: Make tutorial executable, run as part of doc build (#629).
• DOC: Add DOT special characters to documentation (#628).

Maintenance

• Drop support for Python 3.10 (SPEC 0) (#543).
• Bump up CI builds, test with latest windows graphviz release (#550).
• Update fedora tests (#554).
• Update pre-commit (#557).
• Update pyproject.toml to comply with PEP 639 (#578).
• CI: Github actions uses MacOS 15; update macports (#579).
• Add support for Python 3.14 (#576).
• Use pytest's tmp_path fixture (#561).
• Bump webfactory/ssh-agent from 0.9.0 to 0.9.1 (#562).
• Bump scientific-python/attach-next-milestone-action from bc07be829f693829263e57d5e8489f4e57d3d420 to c9cfab10ad0c67fed91b01103db26b7f16634639 (#560).
• Bump actions/checkout from 4 to 6 (#581).
• Bump actions/setup-python from 5 to 6 (#580).
• CI: test CI with choco (#556).
• Drop support for python 3.11 (SPEC 0) (#582).
• CI: fix silent Windows failures and duplicate PR runs (#588).
• Bump webfactory/ssh-agent from 0.9.1 to 0.10.0 (#586).
• CI: cibuildwheel take 4 (#583).
• MAINT: Add swig step to build (#590).
• Bump conda-incubator/setup-miniconda from 3 to 4 (#595).
• Bump actions/upload-artifact from 4 to 7 (#594).
• Bump actions/download-artifact from 4 to 8 (#593).
• Update setuptools version requirement in pyproject.toml (#602).
• Graphviz support across v13 API change (#603).
• CI: Rm fedora/macports testing workflows (#606).
• CI: Build macos wheels against macos 11, and move cibuildwheel to release pipeline (#604).

... (truncated)

Commits

• 4932a9e Designate 2.0 release
• 8716166 Designate 2.0rc4 release
• 1746098 DOC: Add DOT special characters to documentation. (#628)
• c2f11aa DOC: Make tutorial executable, run as part of doc build (#629)
• d8d4939 LIC: Add graphviz license to the wheel (#627)
• 01b18a3 Add Python 3.10 support for 2.0 release (#625)
• 303a4d3 DOC: Fix testing badge readme (#626)
• 50db643 Designate 2.0rc3 release
• 4f234cb TST: Add regression test for gh-171. (#620)
• 7629a90 ENH: Export version info from wrapped graphviz (#624)
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