[PATCH] python: fix for Python 3.11 - python 3 always open in universal mode, U is default mode in 3.0, and removed in 3.11 - mypaint doesn't use ld?n?gettext, so bind_textdomain_codeset isn't needed, that function is deprecated in 3.8 and is no-ops in 3.10 and removed in 3.11
