MNT: Compat with pytest 8.1 #193

Job	Run time
test / Load tox environments	6s
test / py39-test-mpl33 (ubuntu-latest)	41s
test / py39-test-mpl33 (macos-latest)	53s
test / py39-test-mpl33 (windows-latest)	1m 31s
test / py36-test-mpl20 (ubuntu-20.04)	57s
test / py36-test-mpl20 (macos-latest)	2m 6s
test / py36-test-mpl20 (windows-latest)	1m 53s
test / py312-test-mpl38 (ubuntu-latest)	53s
test / py312-test-mpl38 (macos-latest)	54s
test / py312-test-mpl38 (windows-latest)	1m 23s
test / py39-test-mpl38 (ubuntu-latest)	53s
test / py310-test-mpl38 (ubuntu-latest)	45s
test / py310-test-mpl35 (ubuntu-latest)	51s
test / py311-test-mpl36 (ubuntu-latest)	55s
test / py311-test-mpl37 (ubuntu-latest)	53s
test / py39-test-mpl33-pytest62 (ubuntu-latest)	41s
test / py38-test-mpl31-pytest54 (ubuntu-latest)	46s
publish	0s
	17m 1s

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