package/postgresql: bump version to 17.4
Release notes:
https://www.postgresql.org/docs/release/17.4/
https://www.postgresql.org/about/news/postgresql-174-168-1512-1417-and-1320-released-3018/
Signed-off-by: Maxim Kochetkov <fido_max@inbox.ru>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>