Pin pytest to latest version 8.3.1 #533

Job	Run time
matrix-builder	8s
Test on Python 3.7 and ubuntu-20.04 with celery>=4.0.0,<5.0.0	29s
Skipping on Python 3.11 and ubuntu-20.04 with celery>=4.0.0,<5.0.0	17s
Test on Python 3.7 and ubuntu-20.04 with celery>=5.0.0,<6.0.0	28s
Skipping on Python 3.12 and ubuntu-20.04 with celery>=4.0.0,<5.0.0	16s
Test on Python 3.8 and ubuntu-20.04 with celery>=4.0.0,<5.0.0	27s
Test on Python 3.8 and ubuntu-20.04 with celery>=5.0.0,<6.0.0	1m 41s
Test on Python 3.9 and ubuntu-20.04 with celery>=4.0.0,<5.0.0	27s
Test on Python 3.9 and ubuntu-20.04 with celery>=5.0.0,<6.0.0	1m 7s
Test on Python 3.10 and ubuntu-20.04 with celery>=4.0.0,<5.0.0	29s
Test on Python 3.10 and ubuntu-20.04 with celery>=5.0.0,<6.0.0	1m 9s
Test on Python 3.11 and ubuntu-20.04 with celery>=5.0.0,<6.0.0	1m 15s
Test on Python 3.12 and ubuntu-20.04 with celery>=5.0.0,<6.0.0	1m 27s
Test on Python pypy-3.9 and ubuntu-20.04 with celery>=4.0.0,<5.0.0	43s
Test on Python pypy-3.9 and ubuntu-20.04 with celery>=5.0.0,<6.0.0	1m 27s
Test on Python pypy-3.10 and ubuntu-20.04 with celery>=4.0.0,<5.0.0	45s
Test on Python pypy-3.10 and ubuntu-20.04 with celery>=5.0.0,<6.0.0	1m 29s
	14m 4s

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