deps: upgrade to libuv 1.29.1

Notable changes:

- uv_get_constrained_memory() has been added.
- A race condition in uv_async_send() has been fixed.
- uv_get_free_memory() and uv_get_total_memory() now read from
  /proc/meminfo, which should improve correctness when called
  from inside an lxc container.
- A failed assertion in uv_fs_poll_stop() has been fixed.
- A bug in MAC addresses for IP-aliases has been fixed.

Fixes: https://github.com/nodejs/node/issues/27170
Fixes: https://github.com/nodejs/node/issues/27493
PR-URL: https://github.com/nodejs/node/pull/27718
Backport-PR-URL: https://github.com/nodejs/node/pull/31969


Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Ali Ijaz Sheikh <ofrobots@google.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Santiago Gimeno <santiago.gimeno@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>