[3.11] gh-117021: Fix integer overflow in PyLong_AsPid() on non-Windows 64-bit platforms (GH-117064) (GH-117070) (GH-117075)

(cherry picked from commit da2f9d1417a7d28df6e1ced87d64ecf28acb0a5f)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
(cherry picked from commit 519b2ae22b54760475bbf62b9558d453c703f9c6)