GH-89988: Fix memory leak in pickle.Pickler dispatch_table lookup (GH-94298)

(cherry picked from commit 01ef1f95dab9c9930ce1a23634a3e5a8331bf3c7)

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