Tests

[MNT] Fix race condition in `OpenMLSplit._from_arff_file` #2540

Job	Run time
(windows-latest, Py, sk0.24.*, sk-only:false)	4s
(ubuntu-latest, Py3.8, sk0.23.1, sk-only:false)	3s
docker	4s
(ubuntu-latest,Py3.10,sk1.6.*,sk-only:true)	55s
(ubuntu-latest,Py3.10,sk1.7.*,sk-only:true)	1m 3s
(ubuntu-latest,Py3.11,sk1.3.*,sk-only:true)	53s
(ubuntu-latest,Py3.10,sk1.3.*,sk-only:true)	1m 3s
(ubuntu-latest,Py3.11,sk1.5.*,sk-only:true)	1m 3s
(ubuntu-latest,Py3.10,sk1.4.*,sk-only:true)	54s
(ubuntu-latest,Py3.10,sk1.5.*,sk-only:true)	1m 4s
(ubuntu-latest,Py3.11,sk1.6.*,sk-only:true)	55s
(ubuntu-latest,Py3.11,sk1.7.*,sk-only:true)	55s
(ubuntu-latest,Py3.13,sk1.5.*,sk-only:true)	1m 6s
(ubuntu-latest,Py3.14,sk1.7.*,sk-only:true)	1m 18s
(ubuntu-latest,Py3.12,sk1.5.*,sk-only:true)	1m 3s
(ubuntu-latest,Py3.13,sk1.7.*,sk-only:true)	1m 11s
(ubuntu-latest,Py3.12,sk1.4.*,sk-only:true)	1m 31s
(ubuntu-latest,Py3.12,sk1.6.*,sk-only:true)	1m 8s
(ubuntu-latest,Py3.13,sk1.6.*,sk-only:true)	1m 9s
(ubuntu-latest,Py3.12,sk1.3.*,sk-only:true)	1m 3s
(ubuntu-latest,Py3.12,sk1.5.*,sk-only:false)	1h 13m 4s
(ubuntu-latest,Py3.11,sk1.4.*,sk-only:true)	59s
(ubuntu-latest,Py3.12,sk1.7.*,sk-only:true)	1m 5s
(ubuntu-latest,Py3.14,sk1.5.*,sk-only:true)	4m 33s
(ubuntu-latest,Py3.12,sk1.5.,pd:2.,sk-only:false)	1h 12m 56s
(ubuntu-latest,Py3.14,sk1.7.*,sk-only:false)	1h 14m 25s
(ubuntu-latest,Py3.14,sk1.6.*,sk-only:true)	4m 49s
(windows-latest,Py3.12,sk1.5.*,sk-only:false)	1h 17m 16s
	5h 27m 32s

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