Add networkx to environment.yml

[daico007]

PR Summary:

Fix #1102.

PR Checklist

---

• Includes appropriate unit test(s)
• Appropriate docstring(s) are added/updated
• Code is (approximately) PEP8 compliant
• Issue(s) raised/addressed?

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (fa207fb) 89.39% compared to head (7905efa) 89.39%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1103   +/-   ##
=======================================
  Coverage   89.39%   89.39%           
=======================================
  Files          61       61           
  Lines        6235     6235           
=======================================
  Hits         5574     5574           
  Misses        661      661           

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