Add support for CPython 3.12, Pypy 3.10 #351

Job	Run time
matrix-builder	12s
Skipping on Python 3.11 and ubuntu-20.04 with celery>=4.0.0,<5.0.0	19s
Skipping on Python 3.12 and ubuntu-20.04 with celery>=4.0.0,<5.0.0	20s
Test on Python 3.7 and ubuntu-20.04 with celery>=4.0.0,<5.0.0	37s
Test on Python 3.7 and ubuntu-20.04 with celery>=5.0.0,<6.0.0	35s
Test on Python 3.8 and ubuntu-20.04 with celery>=4.0.0,<5.0.0	1m 2s
Test on Python 3.8 and ubuntu-20.04 with celery>=5.0.0,<6.0.0	1m 0s
Test on Python 3.9 and ubuntu-20.04 with celery>=4.0.0,<5.0.0	59s
Test on Python 3.9 and ubuntu-20.04 with celery>=5.0.0,<6.0.0	1m 2s
Test on Python 3.10 and ubuntu-20.04 with celery>=4.0.0,<5.0.0	1m 3s
Test on Python 3.10 and ubuntu-20.04 with celery>=5.0.0,<6.0.0	1m 3s
Test on Python 3.11 and ubuntu-20.04 with celery>=5.0.0,<6.0.0	1m 1s
Test on Python 3.12 and ubuntu-20.04 with celery>=5.0.0,<6.0.0	1m 18s
Test on Python pypy-3.9 and ubuntu-20.04 with celery>=4.0.0,<5.0.0	1m 37s
Test on Python pypy-3.9 and ubuntu-20.04 with celery>=5.0.0,<6.0.0	1m 19s
Test on Python pypy-3.10 and ubuntu-20.04 with celery>=4.0.0,<5.0.0	1m 30s
Test on Python pypy-3.10 and ubuntu-20.04 with celery>=5.0.0,<6.0.0	1m 28s
	16m 25s

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