fix: include networks and volumes in UpheldBy

[aksiksi]

Closes #78.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.40%. Comparing base (1baa2f5) to head (9ac1992).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #77      +/-   ##
==========================================
+ Coverage   75.25%   75.40%   +0.15%     
==========================================
  Files           6        6              
  Lines        1099     1106       +7     
==========================================
+ Hits          827      834       +7     
  Misses        229      229              
  Partials       43       43              

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