First-draft release notes for 17.3.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 572ec03cbec4690eeb5c1047b378626fe475d218
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2025-02-07T16:59:32Z
Releases: 17.3
First-draft release notes for 17.3.

As usual, the release notes for other branches will be made by cutting
these down, but put them up for community review first.

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doc/src/sgml/release-17.sgml modified +1651 −0

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