PostgreSQL 16 RC1 announcement draft

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+The PostgreSQL Global Development Group announces that the first release
+candidate of PostgreSQL 16 is now available for download. As a release
+candidate, PostgreSQL 16 RC 1 will be mostly identical to the initial release of
+PostgreSQL 16, though some more fixes may be applied prior to the general
+availability of PostgreSQL 16.
+
+The planned date for the general availability of PostgreSQL 16 is
+September 14, 2023. Please see the "Release Schedule" section for more details.
+
+Upgrading to PostgreSQL 16 RC 1
+-------------------------------
+
+To upgrade to PostgreSQL 16 RC 1 from earlier versions of PostgreSQL, you will
+need to use a major version upgrade strategy, e.g. `pg_upgrade` or
+`pg_dump` / `pg_restore`. For more information, please visit the documentation
+section on [upgrading](https://www.postgresql.org/docs/16/static/upgrading.html):
+
+[https://www.postgresql.org/docs/16/static/upgrading.html](https://www.postgresql.org/docs/16/static/upgrading.html)
+
+Changes Since 16 Beta 3
+-----------------------
+
+Several bug fixes were applied for PostgreSQL 16 during the Beta 3 period. These
+include:
+
+* The syntax for publishing all tables in a schema using logical replication
+is changed to `CREATE PUBLICATION ... FOR TABLES IN SCHEMA ...`.
+
+
+For a detailed list of fixes, please visit the
+[open items](https://wiki.postgresql.org/wiki/PostgreSQL_16_Open_Items#resolved_before_16rc1)
+page.
+
+Release Schedule
+----------------
+
+This is the first release candidate for PostgreSQL 16. Unless an issue is
+discovered that warrants a delay or to produce an additional release candidate,
+PostgreSQL 16 should be made generally available on September 14, 2023.
+
+For further information please see the
+[Beta Testing](https://www.postgresql.org/developer/beta/) page.
+
+Links
+-----
+
+* [Download](https://www.postgresql.org/download/)
+* [Beta Testing Information](https://www.postgresql.org/developer/beta/)
+* [PostgreSQL 16 Beta Release Notes](https://www.postgresql.org/docs/16/release-16.html)
+* [PostgreSQL 16 Open Issues](https://wiki.postgresql.org/wiki/PostgreSQL_16_Open_Items)
+* [Feature Matrix](https://www.postgresql.org/about/featurematrix/#configuration-management)
+* [Submit a Bug](https://www.postgresql.org/account/submitbug/)
+* [Follow @postgresql on Twitter](https://twitter.com/postgresql)
+* [Donate](https://www.postgresql.org/about/donate/)