Backport PR #23144 on branch v3.5.x (Only import setuptools_scm when we are in a matplotlib git repo) - #23245

Backport PR #23144 on branch v3.5.x (Only import setuptools_scm when we are in a matplotlib git repo)#23245

oscargus merged 1 commit into

matplotlib:v3.5.xmatplotlib/matplotlib:v3.5.xfrom

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