test_import.test_concurrency leaks ref on Windows #106176
Description
On Python 3.12, test_import.test_concurrency() leaks on Windows:
vstinner@WIN C:\victor\python\3.12>python -m test test_import -m test_concurrency -R 3:3
(...)
test_import leaked [22, 36, 28] references, sum=86
bisected to #94504
Potentially Related: #104702
See #102251 (comment) #104796 (comment)