tox += CPython 3.12

Tests now pass with that version.

/reviewed-by @jerome
/reviewed-on !23

setup.py

 # pygolang | pythonic package setup
-# Copyright (C) 2018-2023  Nexedi SA and Contributors.
+# Copyright (C) 2018-2024  Nexedi SA and Contributors.
 #                          Kirill Smelkov <kirr@nexedi.com>
 #
 # This program is free software: you can Use, Study, Modify and Redistribute
@@ -353,6 +353,7 @@ setup(
         Programming Language :: Python :: 3.9
         Programming Language :: Python :: 3.10
         Programming Language :: Python :: 3.11
+        Programming Language :: Python :: 3.12
         Programming Language :: Python :: Implementation :: CPython
         Programming Language :: Python :: Implementation :: PyPy
         Operating System :: POSIX

tox.ini

 [tox]
 envlist =
-    {py27d,py27,py37,py38,py39d,py39,py310d,py310,py311d,py311,pypy,pypy3}-{thread,gevent}
+    {py27d,py27,py37,py38,py39d,py39,py310d,py310,py311d,py311,py312,pypy,pypy3}-{thread,gevent}
 
 
 # ThreadSanitizer
@@ -10,18 +10,18 @@ envlist =
 # (*) PyPy locks its GIL (see RPyGilAcquire) by manually doing atomic cmpxchg
 # and other games, which TSAN cannot see if PyPy itself was not compiled with
 # -fsanitize=thread.
-    {py27d,py27,py37,py38,py39d,py39,py310d,py310,py311d,py311           }-{thread       }-tsan
+    {py27d,py27,py37,py38,py39d,py39,py310d,py310,py311d,py311,py312           }-{thread       }-tsan
 # XXX py*-gevent-tsan would be nice to have, but at present TSAN is not
 # effective with gevent, because it does not understand greenlet "thread"
 # switching and so perceives the program as having only one thread where races
 # are impossible. Disabled to save time.
-#   {py27d,py27,py37,py38,py39d,py39,py310d,py310,py311d,py311           }-{       gevent}-tsan
+#   {py27d,py27,py37,py38,py39d,py39,py310d,py310,py311d,py311,py312           }-{       gevent}-tsan
 
 
 # AddressSanitizer
 
 # XXX asan does not work with gevent: https://github.com/python-greenlet/greenlet/issues/113
-    {py27d,py27,py37,py38,py39d,py39,py310d,py310,py311d,py311,pypy,pypy3}-{thread       }-asan
+    {py27d,py27,py37,py38,py39d,py39,py310d,py310,py311d,py311,py312,pypy,pypy3}-{thread       }-asan
 
 [testenv]
 basepython =
@@ -35,6 +35,8 @@ basepython =
     py310:  python3.10
     py311d: python3.11-dbg
     py311:  python3.11
+    py312:  python3.12
+    py312d: python3.12-dbg
     pypy:   pypy
     pypy3:  pypy3
 
@@ -72,5 +74,5 @@ commands=
 # asan/tsan: tell pytest not to capture output - else it is not possible to see
 # reports from sanitizers because they crash tested process on error.
 # likewise for python debug builds.
-        asan,tsan,py{27,39,310,311}d: -s    \
+        asan,tsan,py{27,39,310,311,312}d: -s    \
         gpython/ golang/