Deprecation of pydot package

[TathagataChakraborti]

Something to keep an eye out for. 👀

DeprecationWarning: nx.nx_pydot.to_pydot depends on the pydot package, which has
known issues and is not actively maintained.

See https://github.com/networkx/networkx/issues/5723
  A = nx.nx_pydot.to_pydot(K5)  # conversion to pydot
DeprecationWarning: nx.nx_pydot.from_pydot depends on the pydot package, which has
known issues and is not actively maintained.

See https://github.com/networkx/networkx/issues/5723
  _ = nx.nx_pydot.from_pydot(A)  # return MultiGraph