MNT: Compat with pytest 8.1 #199

Job	Run time
test / Load tox environments	8s
test / py39-test-mpl33 (ubuntu-latest)	3m 2s
test / py39-test-mpl33 (macos-latest)	4m 1s
test / py39-test-mpl33 (windows-latest)	3m 23s
test / py36-test-mpl20 (ubuntu-20.04)	2m 14s
test / py36-test-mpl20 (macos-latest)	5m 25s
test / py36-test-mpl20 (windows-latest)	3m 18s
test / py312-test-mpl38 (ubuntu-latest)	4m 7s
test / py312-test-mpl38 (macos-latest)	7m 54s
test / py312-test-mpl38 (windows-latest)	5m 14s
test / py39-test-mpl38 (ubuntu-latest)	2m 58s
test / py310-test-mpl38 (ubuntu-latest)	3m 6s
test / py310-test-mpl35 (ubuntu-latest)	3m 49s
test / py311-test-mpl36 (ubuntu-latest)	3m 16s
test / py311-test-mpl37 (ubuntu-latest)	3m 16s
test / py312-test-mpldev-pytestdev (ubuntu-latest)	2m 44s
test / py39-test-mpl33-pytest62 (ubuntu-latest)	3m 3s
test / py38-test-mpl31-pytest54 (ubuntu-latest)	2m 3s
publish	0s
	1h 3m 1s

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