MNT: Compat with pytest 8.1 #198

Job	Run time
test / Load tox environments	3s
test / py39-test-mpl33 (ubuntu-latest)	3m 13s
test / py39-test-mpl33 (macos-latest)	3m 47s
test / py39-test-mpl33 (windows-latest)	3m 56s
test / py36-test-mpl20 (ubuntu-20.04)	2m 22s
test / py36-test-mpl20 (macos-latest)	3m 17s
test / py36-test-mpl20 (windows-latest)	3m 21s
test / py312-test-mpl38 (ubuntu-latest)	4m 10s
test / py312-test-mpl38 (macos-latest)	4m 56s
test / py312-test-mpl38 (windows-latest)	4m 42s
test / py39-test-mpl38 (ubuntu-latest)	3m 11s
test / py310-test-mpl38 (ubuntu-latest)	3m 6s
test / py310-test-mpl35 (ubuntu-latest)	3m 16s
test / py311-test-mpl36 (ubuntu-latest)	3m 9s
test / py311-test-mpl37 (ubuntu-latest)	3m 29s
test / py312-test-mpldev-pytestdev (ubuntu-latest)	2m 40s
test / py39-test-mpl33-pytest62 (ubuntu-latest)	3m 26s
test / py38-test-mpl31-pytest54 (ubuntu-latest)	2m 3s
publish	0s
	58m 7s

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