MNT: Compat with pytest 8.1 #194

Job	Run time
test / Load tox environments	8s
test / py39-test-mpl33 (ubuntu-latest)	2m 57s
test / py39-test-mpl33 (macos-latest)	4m 39s
test / py39-test-mpl33 (windows-latest)	3m 42s
test / py36-test-mpl20 (ubuntu-20.04)	2m 30s
test / py36-test-mpl20 (macos-latest)	3m 40s
test / py36-test-mpl20 (windows-latest)	4m 13s
test / py312-test-mpl38 (ubuntu-latest)	4m 23s
test / py312-test-mpl38 (macos-latest)	4m 54s
test / py312-test-mpl38 (windows-latest)	4m 57s
test / py39-test-mpl38 (ubuntu-latest)	3m 1s
test / py310-test-mpl38 (ubuntu-latest)	2m 56s
test / py310-test-mpl35 (ubuntu-latest)	3m 9s
test / py311-test-mpl36 (ubuntu-latest)	2m 55s
test / py311-test-mpl37 (ubuntu-latest)	4m 27s
test / py39-test-mpl33-pytest62 (ubuntu-latest)	3m 21s
test / py38-test-mpl31-pytest54 (ubuntu-latest)	2m 9s
publish	0s
	58m 1s

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