[metrics-bugs] #34298 [Metrics/Onionperf]: Address networkx's API change, which breaks OnionPerf

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#34298: Address networkx's API change, which breaks OnionPerf
-----------------------------------+----------------------
     Reporter:  phw                |      Owner:  phw
         Type:  defect             |     Status:  assigned
     Priority:  Medium             |  Milestone:
    Component:  Metrics/Onionperf  |    Version:
     Severity:  Normal             |   Keywords:
Actual Points:                     |  Parent ID:
       Points:  0.1                |   Reviewer:
      Sponsor:                     |
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 Networkx in version
 [https://networkx.github.io/documentation/stable/release/release_2.4.html
 2.4] deprecated the `node` attribute of `DiGraph` and suggests using
 `nodes` instead. This breaks OnionPerf but luckily, it's an easy fix.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/34298>
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