Add support for Python 3.12. (#2172) #1979

Job	Run time
Check GitHub Organization	1s
(PyPy 2.7) Pip 20 TOXENV=pypy27	20m 29s
(PyPy 3.9) Pip 20 TOXENV=pypy39	33m 55s
(PyPy 3.9) Pip 22_3_1 TOXENV=pypy39	25m 35s
(PyPy 3.9) Pip 23_1_2 TOXENV=pypy39	29m 49s
(macos-12) Pip 20 TOXENV=py27	24m 45s
(ubuntu-22.04) Pip 20 TOXENV=py27	10m 45s
(ubuntu-20.04) Pip 20 TOXENV=py35	13m 45s
TOXENV=format-check,typecheck,vendor-check,package -- --additional-format sdist --additional-form...	5m 9s
(macos-12) Pip 20 TOXENV=py311	26m 56s
(ubuntu-22.04) Pip 20 TOXENV=py311	15m 29s
(ubuntu-22.04) Pip 22_3_1 TOXENV=py311	16m 5s
(ubuntu-22.04) Pip 23_1_2 TOXENV=py311	15m 32s
(macos-12) Pip 23_2 TOXENV=py312	25m 26s
(ubuntu-22.04) Pip 23_2 TOXENV=py312	13m 48s
(macos-12) Pip 20 TOXENV=py27-integration	1h 16m 20s
(ubuntu-22.04) Pip 20 TOXENV=py27-integration	40m 21s
(ubuntu-22.04) Pip 22_3_1 TOXENV=py37-integration	2h 7m 21s
(ubuntu-22.04) Pip 23_1_2 TOXENV=py37-integration	1h 27m 43s
(macos-12) Pip 20 TOXENV=py311-integration	1h 0m 20s
(ubuntu-22.04) Pip 20 TOXENV=py311-integration	36m 43s
(ubuntu-22.04) Pip 22_3_1 TOXENV=py311-integration	55m 14s
(ubuntu-22.04) Pip 23_1_2 TOXENV=py311-integration	42m 0s
(macos-12) Pip 23_2 TOXENV=py312-integration	1h 15m 22s
(ubuntu-22.04) Pip 23_2 TOXENV=py312-integration	1h 11m 11s
(PyPy 2.7) Pip 20 TOXENV=pypy27-integration	45m 53s
(PyPy 3.9) Pip 20 TOXENV=pypy39-integration	58m 22s
(PyPy 3.9) Pip 22_3_1 TOXENV=pypy39-integration	1h 12m 32s
(PyPy 3.9) Pip 23_1_2 TOXENV=pypy39-integration	1h 22m 47s
Gather Final Status	1s
	20h 9m 39s

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