upgrade to pytest 8 #914

Job	Run time
lint	39s
build	30s
cleanup_buckets	2s
test-windows-bundle (windows-2019)	2m 45s
test-docker	1m 38s
test-windows-bundle (windows-latest)	2m 39s
test-linux-bundle	2m 27s
test (ubuntu-latest, 3.8)	2m 51s
test (ubuntu-latest, 3.9)	5m 18s
test (ubuntu-latest, 3.10)	5m 52s
test (ubuntu-latest, 3.11)	4m 54s
test (ubuntu-latest, 3.12)	7m 2s
test (ubuntu-latest, 3.13)	10m 8s
test (ubuntu-latest, pypy3.9)	12m 56s
test (ubuntu-latest, pypy3.10)	12m 54s
test (macos-latest, 3.10)	3m 14s
test (macos-latest, 3.11)	3m 13s
test (macos-latest, 3.12)	3m 34s
test (macos-latest, 3.13)	5m 0s
test (macos-latest, pypy3.9)	10m 29s
test (windows-latest, 3.8)	3m 13s
test (windows-latest, 3.9)	6m 6s
test (windows-latest, 3.10)	6m 13s
test (windows-latest, 3.11)	6m 1s
test (windows-latest, 3.12)	6m 23s
test (windows-latest, 3.13)	9m 22s
test (windows-latest, pypy3.9)	18m 45s
test (macos-13, 3.8)	5m 41s
test (macos-13, 3.9)	7m 38s
doc	54s
	2h 48m 21s

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