Release pgx 0.5.3 (pgcentralfoundation#787)

This cuts pgx 0.5.3, which is mostly a bugfix release that covers a handful of
errors that had crept in to the end of the 0.5.0 test and release cycle.

Merge pull request pgcentralfoundation#770 from tcdi/0.5.2-quick

prepare for v0.5.2

prepare for a quick 0.5.1

- merge in pgcentralfoundation#763
- bump version numbers

Release pgx 0.5.0 (pgcentralfoundation#751)

Release 0.5.0-beta.1

Bump for v0.5.0-beta.0 (pgcentralfoundation#583)

* Bump for v0.5.0-rc.1

* ^H^H^H^Hbeta.0

Merge branch 'develop'

Merge pull request pgcentralfoundation#557 from tcdi/develop

Prepare 0.4.4

Merge pull request pgcentralfoundation#544 from tcdi/prep-0.4.3

Prep 0.4.3

Merge 0.4.2 into master (pgcentralfoundation#523)

* update copyright headers (pgcentralfoundation#511)

* Add pg_operator.h (pgcentralfoundation#512)

* Add include for pg_operator.h

* Regenerate bindings

* Add Copy and Clone to the time_stamp_* types (pgcentralfoundation#509)

* Add from impls for pg_sys -> pgx timestamp* (pgcentralfoundation#510)

* Remove dead --workspace flag on cargo pgx test (pgcentralfoundation#520)

* Pass RUSTFLAGS to rustc on schema generate (pgcentralfoundation#513)

* Prepare 0.4.2 (pgcentralfoundation#522)

* upgrade dependencies

* bump version to v0.4.2

Co-authored-by: Einar <[email protected]>
Co-authored-by: James Sewell <[email protected]>
Co-authored-by: Ana Hobden <[email protected]>