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matplotlib
our testsuite produces hundreds of warnings like this (example log from BUG: memleak part 3 (CFFI only) #819 :https://github.com/darshan-hpc/darshan/actions/runs/3137604371/jobs/5095963509) :this originates from this upstream PR: Move towards having get_shared_{x,y}_axes return immutable views. matplotlib/matplotlib#21584
turn this warning into an error in our CI, to prevent further introductions of the deprecated functionality, and fix it up where we already use it, based on the directions in the PR above