stepping down as the backend_ps maintainer

Hi John,

in case it is not obvious from my inactivity: it turns out that I have
not enough time and energy to do much for matplotlib's PostScript backend.
Therefore I would prefer not to be considered the backend maintainer any
more :frowning:

Of course I will continue to follow the matplotlib development and will
try to provide patches from time to time.

All the best,
Jochen

路路路

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