bind: Update to 9.16.30

bind: Update to 9.16.30

For details see:
https://downloads.isc.org/isc/bind9/9.16.30/doc/arm/html/notes.html#notes-for-bind-9-16-30

"Bug Fixes

    The fetches-per-server quota is designed to adjust itself downward
    automatically when an authoritative server times out too frequently.
    Due to a coding error, that adjustment was applied incorrectly,
    so that the quota for a congested server was always set to 1. This
    has been fixed. [GL #3327]

    DNSSEC-signed catalog zones were not being processed correctly. This
    has been fixed. [GL #3380]

    Key files were updated every time the dnssec-policy key manager ran,
    whether the metadata had changed or not. named now checks whether
    changes were applied before writing out the key files. [GL #3302]"

Signed-off-by: Matthias Fischer <matthias.fischer@ipfire.org>
Reviewed-by: Peter Müller <peter.mueller@ipfire.org>