[packaging] missing quotation in graphviz printout (#48344)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/48344
Test Plan: Imported from OSS
Reviewed By: suo
Differential Revision: D25236018
Pulled By: zdevito
fbshipit-source-id: cb69ec35b86228dfcd1f2823db2b2150a9d3e8b9
