Add official support for Python 3.12 / Pip 23.2. #1986

Job	Run time
Check GitHub Organization	1s
(macos-12) Pip 20 TOXENV=py27	39m 42s
(ubuntu-22.04) Pip 20 TOXENV=py27	21m 7s
(ubuntu-20.04) Pip 20 TOXENV=py35	24m 12s
(PyPy 2.7) Pip 20 TOXENV=pypy27	26m 48s
(PyPy 3.9) Pip 20 TOXENV=pypy39	46m 36s
(PyPy 3.9) Pip 22_3_1 TOXENV=pypy39	35m 6s
(PyPy 3.9) Pip 23_1_2 TOXENV=pypy39	34m 22s
TOXENV=format-check,typecheck,vendor-check,package -- --additional-format sdist --additional-form...	6m 47s
(macos-12) Pip 20 TOXENV=py311-integration	1h 19m 28s
(ubuntu-22.04) Pip 20 TOXENV=py311-integration	47m 33s
(ubuntu-22.04) Pip 22_3_1 TOXENV=py311-integration	45m 11s
(ubuntu-22.04) Pip 23_1_2 TOXENV=py311-integration	58m 17s
(macos-12) Pip 23_2 TOXENV=py312-integration	1h 18m 12s
(ubuntu-22.04) Pip 23_2 TOXENV=py312-integration	1h 8m 14s
(macos-12) Pip 20 TOXENV=py27-integration	1h 10m 45s
(ubuntu-22.04) Pip 20 TOXENV=py27-integration	38m 35s
(ubuntu-22.04) Pip 22_3_1 TOXENV=py37-integration	1h 19m 28s
(ubuntu-22.04) Pip 23_1_2 TOXENV=py37-integration	1h 19m 26s
(macos-12) Pip 20 TOXENV=py311	43m 29s
(ubuntu-22.04) Pip 20 TOXENV=py311	24m 16s
(ubuntu-22.04) Pip 22_3_1 TOXENV=py311	24m 25s
(ubuntu-22.04) Pip 23_1_2 TOXENV=py311	24m 15s
(macos-12) Pip 23_2 TOXENV=py312	23m 4s
(ubuntu-22.04) Pip 23_2 TOXENV=py312	24m 6s
(PyPy 2.7) Pip 20 TOXENV=pypy27-integration	1h 3m 45s
(PyPy 3.9) Pip 20 TOXENV=pypy39-integration	55m 55s
(PyPy 3.9) Pip 22_3_1 TOXENV=pypy39-integration	1h 4m 1s
(PyPy 3.9) Pip 23_1_2 TOXENV=pypy39-integration	1h 4m 3s
Gather Final Status	1s
	21h 31m 10s

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