Use matplotlib's agg backend in test_figure.py. #706
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By default, matplotlib will use an interactive backend when it detects that one is available. This is both unnecessary and, in some cases, can break builds.
One example of a build breaking is on macOS Ventura when these tests are run using a non-root user (such as a user used for builds) that is not the logged-in user. The interactive macOS backend crashes with an error in _xpc_api_misuse when creating an NSWindow, likely due to some tighter security requirements.