pBilby testing uses very old test images
I noticed that the pBilby tests run on Bilby generated test images from an outdated source.
The up to date images are here, usage can be found, e.g., here.
Also, we're going to drop py37 support on the next release. I suggest that pBilby follows suit and updates the testing to cover 3.8 and 3.9. (We're following the numpy deprecation timeline along with various other pieces of LVK software.)