chore(deps): Support networkx major version 3

[corneliusroemer]

No relevant breaking changes per changelog: https://networkx.org/documentation/stable/release/release_3.0.html#api-changes

We only use networkx in one place.

Basically just housekeeping to relax upward pins we don't need.

Description of proposed changes

Related issue(s)

Checklist

• Automated checks pass
• Check if you need to add a changelog message
• Check if you need to add tests
• Check if you need to update docs

[corneliusroemer]

Feel free to merge @victorlin - tests pass with latest networkx and there's been no code changes, so we should be all good. Changelog doesn't contain anything of concern.

[victorlin]

Force-pushed onto latest master.

The single place where networkx is used is covered by tests, so this looks good to go.