MatplotlibDeprecationWarning with unexpected argument for savefig()

[elyurn]

Description

Using the development version of proplot in a venv to get the matplotlib version 3.4.3, I have a deprecation warning with savefig()

Steps to reproduce

import proplot as pplt
pplt.subplots()

Expected behavior: No warning :)

Actual behavior:

.../env/lib/python3.11/site-packages/proplot/figure.py:464: MatplotlibDeprecationWarning: savefig() got unexpected keyword argument "facecolor" which is no longer supported as of 3.3 and will become an error two minor releases later
  return func(self, *args, **kwargs)
.../env/lib/python3.11/site-packages/proplot/figure.py:464: MatplotlibDeprecationWarning: savefig() got unexpected keyword argument "edgecolor" which is no longer supported as of 3.3 and will become an error two minor releases later
  return func(self, *args, **kwargs)
.../env/lib/python3.11/site-packages/proplot/figure.py:464: MatplotlibDeprecationWarning: savefig() got unexpected keyword argument "orientation" which is no longer supported as of 3.3 and will become an error two minor releases later
  return func(self, *args, **kwargs)
.../env/lib/python3.11/site-packages/proplot/figure.py:464: MatplotlibDeprecationWarning: savefig() got unexpected keyword argument "bbox_inches_restore" which is no longer supported as of 3.3 and will become an error two minor releases later
  return func(self, *args, **kwargs)

Proplot version

matplotlib: 3.4.3 proplot: 0.9.5.post360