SUSE-SU-2026:0784-1

This update for postgresql16 fixes the following issue:

Update to version 16.13 (bsc#1258754).

Regression fixes:

• the substring() function raises an error 'invalid byte sequence for encoding' on non-ASCII text values if the source of that value is a database column (caused by CVE-2026-2006 fix).
• a standby may halt and return an error 'could not access status of transaction'.