Description of the patch:
This update for postgresql15 fixes the following issues
Security issues:
- CVE-2026-6472: ensure the user has CREATE privilege on the schema specified (bsc#1265172).
- CVE-2026-6473: integer overflows in memory-allocation calculations (bsc#1265173).
- CVE-2026-6474: Guard against malicious time zone names (bsc#1265174).
- CVE-2026-6475: Prevent path traversal in pg_basebackup and pg_rewind (bsc#1265175).
- CVE-2026-6477: Mark PQfn() as unsafe, and avoid using it within libpq (bsc#1265177).
- CVE-2026-6478: Use timing-safe string comparisons in authentication code (bsc#1265178).
- CVE-2026-6479: Prevent unbounded recursion while processing startup packets (bsc#1265179).
- CVE-2026-6637: Prevent SQL injection and buffer overruns in contrib/spi (bsc#1265181).
Non security issue:
- Updated to version 15.18.
- Get rid of update-alternatives for openSUSE/SLE 16.0 and newer
to support immutable systems and transactional updates. (jsc#PED-14823)