Update to libuv 1.44.2
    
    See #3586 for details.
    
    Important bugs fixed
    loop: better align order-of-events behavior between platforms #3598
    zos: fix fs event not fired if the watched file is moved/removed/recreated #3540
    win: Fix pipe resource leak if closed during connect (and other bugs) #3611
    zos: don't error when killing a zombie process #3625
    
    Regressions fixed
    macos: avoid posix_spawnp() cwd bug #3597
    kqueue: skip EVFILT_PROC events when invalidating events for an fd. #3629
    
    Signed-off-by: Stephen Gallagher <sgallagh@redhat.com>