PostgreSQL 17 release announcement draft

Hi,

Attached is the draft of the PostgreSQL 17 release announcement. This is
a draft of the text that will go into the press kit, with the key
portions to review starting from the top of the document, up until the
"About PostgreSQL" section.

Please provide feedback on content accuracy, notable omissions or items
that should be excluded, or if an explanation is unclear and needs
better phrasing. On the last point, I'm looking to ensure the wording is
clear and is easy to translate into different languages.

Based on feedback, I'll be posting a revision once a day (if there's
feedback) until the review cut-off. We'll have to freeze the
announcement by Mon, Sep 9 @ 12:00 UTC so we can begin the translation
process.

Thank you for your help with the release process!

Jonathan