Remove nose import. #3123

Job	Run time
build (ubuntu-latest, 3.9)	4m 43s
check_release	1m 40s
build (ubuntu-latest, 3.10)	4m 48s
link_check	3m 19s
build (ubuntu-latest, 3.11)	4m 35s
Make SDist	24s
build (ubuntu-latest, 3.12)	6m 31s
test_docs	44s
build (ubuntu-latest, 3.13)	5m 29s
build (ubuntu-latest, pypy-3.9)	4m 10s
Test Minimum Versions	2m 19s
Test Lint	56s
build (ubuntu-latest, pypy-3.10)	3m 48s
build (windows-latest, 3.9)	8m 57s
Test Prereleases	2m 2s
build (windows-latest, 3.10)	7m 54s
test_without_debugpy (ubuntu-latest, 3.9)	1m 59s
build (windows-latest, 3.11)	6m 43s
build (windows-latest, 3.12)	9m 17s
build (windows-latest, 3.13)	9m 18s
build (windows-latest, pypy-3.9)	8m 5s
build (windows-latest, pypy-3.10)	7m 17s
build (macos-latest, 3.9)	5m 6s
build (macos-latest, 3.10)	5m 49s
build (macos-latest, 3.11)	5m 20s
build (macos-latest, 3.12)	5m 47s
build (macos-latest, 3.13)	5m 33s
build (macos-latest, pypy-3.9)	4m 58s
build (macos-latest, pypy-3.10)	4m 30s
Install from SDist and Test	2m 7s
coverage	0s
	2h 24m 8s

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