[3.12] gh-101225: Increase the socket backlog when creating a multiprocessing.connection.Listener (GH-113567) (#114018)

gh-101225: Increase the socket backlog when creating a multiprocessing.connection.Listener (GH-113567)

Increase the backlog for multiprocessing.connection.Listener` objects created
 by `multiprocessing.manager` and `multiprocessing.resource_sharer` to
 significantly reduce the risk of getting a connection refused error when creating
 a `multiprocessing.connection.Connection` to them.
(cherry picked from commit c7d59bd8cfa053e77ae3446c82afff1fd38a4886)

Co-authored-by: Ronald Oussoren <ronaldoussoren@mac.com>
Co-authored-by: Adam Turner <9087854+AA-Turner@users.noreply.github.com>