GH-94736: Fix _multiprocessing.SemLock subclassing (GH-94738)

* fix allocator and deallocator

* 📜🤖 Added by blurb_it.

* code review

Co-authored-by: blurb-it[bot] <43283697+blurb-it[bot]@users.noreply.github.com>
(cherry picked from commit f5b76330cfb93e1ad1a77c71dafe719f6a808cec)

Co-authored-by: Kumar Aditya <59607654+kumaraditya303@users.noreply.github.com>