SUSE-SU-2025:20024-1 Security update for unbound

This update for unbound fixes the following issues: - Update to 1.20.0: Features: The config for discard-timeout, wait-limit, wait-limit-cookie, wait-limit-netblock and wait-limit-cookie-netblock was added, for the fix to the DNSBomb issue. Merge GH1027: Introduce 'cache-min-negative-ttl' option...