Pin pytest to latest version 8.1.1 #458

Job	Run time
matrix-builder	12s
Skipping on Python 3.11 and ubuntu-20.04 with celery>=4.0.0,<5.0.0	16s
Skipping on Python 3.12 and ubuntu-20.04 with celery>=4.0.0,<5.0.0	18s
Test on Python 3.7 and ubuntu-20.04 with celery>=4.0.0,<5.0.0	30s
Test on Python 3.7 and ubuntu-20.04 with celery>=5.0.0,<6.0.0	30s
Test on Python 3.8 and ubuntu-20.04 with celery>=4.0.0,<5.0.0	1m 26s
Test on Python 3.8 and ubuntu-20.04 with celery>=5.0.0,<6.0.0	1m 16s
Test on Python 3.9 and ubuntu-20.04 with celery>=4.0.0,<5.0.0	1m 18s
Test on Python 3.9 and ubuntu-20.04 with celery>=5.0.0,<6.0.0	1m 15s
Test on Python 3.10 and ubuntu-20.04 with celery>=4.0.0,<5.0.0	1m 21s
Test on Python 3.10 and ubuntu-20.04 with celery>=5.0.0,<6.0.0	1m 11s
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 23s
Test on Python pypy-3.9 and ubuntu-20.04 with celery>=4.0.0,<5.0.0	1m 44s
Test on Python pypy-3.9 and ubuntu-20.04 with celery>=5.0.0,<6.0.0	1m 43s
Test on Python pypy-3.10 and ubuntu-20.04 with celery>=4.0.0,<5.0.0	1m 53s
Test on Python pypy-3.10 and ubuntu-20.04 with celery>=5.0.0,<6.0.0	1m 40s
	19m 11s

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