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 #1027: Introduce 'cache-min-negative-ttl' option.
    
    Merge #1043 from xiaoxiaoafeifei: Add loongarch support; updates
    config.guess(2024-01-01) and config.sub(2024-01-01), verified with upstream.
    
    Implement cachedb-check-when-serve-expired: yes option, default is enabled.
    When serve expired is enabled with cachedb, it first checks cachedb before
    serving the expired response.
    
    Fix #876: [FR] can unbound-checkconf be silenced when configuration is valid?
    
    And bug fixes.
    
    https://nlnetlabs.nl/projects/unbound/download/#unbound-1-20-0
    
    Resolves: CVE-2024-33655