Update networkx

[katarinasupe]

Description

I updated networkx version. This excludes usage of v2, but v3 has been out for a long time now and I think this breaking change should happen.

I also updated the lock file.

Pull request type

Please delete options that are not relevant.

• Build or packaging related changes

Related issues

Closes #321

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

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Reviewer checklist (the reviewer checks this part)

• Core feature implementation
• Tests
• Code documentation
• Documentation on gqlalchemy/docs

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