[3.13] gh-142048: Fix lost gc allocations count on thread cleanup (GH… (#142506)

[3.13] gh-142048: Fix lost gc allocations count on thread cleanup (GH-142233)
(cherry picked from commit 49b1fb43f65290dadeb83ed6f7c0c74995fda7a1)

Co-authored-by: Kevin Wang <kevmo314@gmail.com>