2023-08-10 release announcement draft

Hi,

Attached is the release announcement draft for the 2023-08-10 update 
release, which also includes the release of PostgreSQL 16 Beta 3.

Please provide your feedback no later than August 10, 2023 0:00 AoE[1].

Thanks,

Jonathan

[1] https://en.wikipedia.org/wiki/Anywhere_on_Earth