``test_capi`` leaks references

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Bug report

Bug description:

admin@Admins-MacBook-Air ~/p/cpython (main)> ./python.exe -m test -R 3:3 test_capi
Using random seed: 2315181180
0:00:00 load avg: 88.93 Run 1 test sequentially in a single process
0:00:00 load avg: 88.93 [1/1] test_capi
beginning 6 repetitions. Showing number of leaks (. for 0 or less, X for 10 or more)
123:456
XXX XXX
test_capi leaked [10838, 10834, 10838] references, sum=32510
test_capi leaked [8036, 8034, 8036] memory blocks, sum=24106
test_capi failed (reference leak) in 43.4 sec

== Tests result: FAILURE ==

1 test failed:
    test_capi

Total duration: 43.4 sec
Total tests: run=985 skipped=67
Total test files: run=1/1 failed=1
Result: FAILURE

CPython versions tested on:

CPython main branch

Operating systems tested on:

macOS

Linked PRs

• gh-125512: Revert "gh-124872: Replace enter/exit events with "switched" (#124776)" #125513
• gh-124872: Replace enter/exit events with "switched" #125532

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Bisected to 843d28f

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cc @rhansen

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FYI, I'm going to revert it to make the buildbots green. We can later revert the revert with the actual fix :)