Ensure IPython's HistoryManager threads don't leak #4085

Job	Run time
test_docs	50s
test_without_debugpy (ubuntu-latest, 3.9)	2m 33s
check_release	43s
Make SDist	24s
Test Minimum Versions	2m 56s
link_check	3m 57s
Test Prereleases	20m 15s
Test Lint	54s
build (ubuntu-latest, pypy-3.9)	1m 1s
build (ubuntu-latest, 3.10)	3m 0s
build (ubuntu-latest, 3.13)	2m 17s
build (ubuntu-latest, 3.11)	2m 21s
build (windows-latest, 3.13)	3m 28s
build (windows-latest, 3.9)	2m 19s
build (ubuntu-latest, pypy-3.10)	28s
build (windows-latest, pypy-3.10)	9m 40s
build (macos-latest, 3.11)	2m 32s
build (windows-latest, 3.12)	3m 17s
build (macos-latest, pypy-3.10)	4m 54s
build (windows-latest, 3.11)	3m 23s
build (ubuntu-latest, 3.9)	27s
build (macos-latest, 3.13)	2m 18s
build (windows-latest, 3.10)	3m 0s
build (macos-latest, 3.10)	2m 56s
build (macos-latest, 3.12)	2m 46s
build (ubuntu-latest, 3.12)	2m 28s
build (windows-latest, pypy-3.9)	36s
build (macos-latest, pypy-3.9)	48s
build (macos-latest, 3.9)	34s
Install from SDist and Test	2m 11s
coverage	-1s
	1h 29m 15s

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