Update to rebased rust-postgres (#10584)

Update to a rebased version of our rust-postgres patches, rebased on
[this](sfackler/rust-postgres@98f5a11)
commit this time.

With #10280 reapplied, this means that the rust-postgres crates will be
deduplicated, as the new crate versions are finally compatible with the
requirements of diesel-async.

Earlier update: #10561

rust-postgres PR: neondatabase/rust-postgres#39

Author: arpad-m