Update postgresql15 to version 15.6 / rev 14 via SR 1145269
    
    https://build.opensuse.org/request/show/1145269
    by user rmax + anag+factory
    - Upgrade to 15.6:
      * bsc#1219679, CVE-2024-0985: Tighten security restrictions
        within REFRESH MATERIALIZED VIEW CONCURRENTLY.
        One step of a concurrent refresh command was run under weak
        security restrictions. If a materialized view's owner could
        persuade a superuser or other high-privileged user to perform a
        concurrent refresh on that view, the view's owner could control
        code executed with the privileges of the user running REFRESH.
        Fix things so that all user-determined code is run as the
        view's owner, as expected
      * If you use GIN indexes, you may need to reindex after updating
        to this release.
      * LLVM 18 is now supported.
      * https://www.postgresql.org/docs/release/15.6/