MAINT: Update matplotlib (#9696)
MAINT: Update matplotlib (#9696)

* MAINT: Update matplotlib

* FIX: Flake

* FIX: Fine
Eric89GXL/mne-python,pravsripad/mne-python,wmvanvliet/mne-python,Teekuningas/mne-python,kingjr/mne-python,bloyl/mne-python,kingjr/mne-python,drammock/mne-python,pravsripad/mne-python,Teekuningas/mne-python,wmvanvliet/mne-python,Teekuningas/mne-python,mne-tools/mne-python,olafhauk/mne-python,pravsripad/mne-python,drammock/mne-python,larsoner/mne-python,bloyl/mne-python,larsoner/mne-python,Eric89GXL/mne-python,mne-tools/mne-python,kingjr/mne-python,drammock/mne-python,larsoner/mne-python,olafhauk/mne-python,olafhauk/mne-python,wmvanvliet/mne-python,mne-tools/mne-python