*: upgrade postgres crates

[petrosagg]

Motivation

I tidied up our rust-postgres fork and also brought in all changes from upstream. This PR brings in those changes. The highlight of those changes is that logical replication support is now a clean extension of the low level CopyBoth mechanism exposed by this upstream PR https://github.com/sfackler/rust-postgres/pull/778

Tips for reviewer

Checklist

• [ ] This PR has adequate test coverage / QA involvement has been duly considered. (trigger-ci for additional test/nightly runs)
• [ ] This PR has an associated up-to-date design doc, is a design doc (template), or is sufficiently small to not require a design.
• [ ] If this PR evolves an existing $T ⇔ Proto$T mapping (possibly in a backwards-incompatible way), then it is tagged with a T-proto label.
• [ ] If this PR will require changes to cloud orchestration or tests, there is a companion cloud PR to account for those changes that is tagged with the release-blocker label (example).
• [ ] If this PR includes major user-facing behavior changes, I have pinged the relevant PM to schedule a changelog post.