Memory leak of `NoDefaultType` in `_typing`

[ZeroIntensity]

Bug report

Bug description:

Quick reproducer:

$ ./python -X showrefcount -c "import _typing"
[8 refs, 0 blocks]

The underlying leaked object is NoDefaultType. I think this was caused by gh-118897 (cc @JelleZijlstra).

CPython versions tested on:

CPython main branch

Operating systems tested on:

Linux

Linked PRs

• gh-123448: Move _PyNoDefault_Type to the static types array #123449
• [3.13] gh-123448: Move _PyNoDefault_Type to the static types array (GH-123449) #123450

[JelleZijlstra]

Thanks!