bind: Update to 9.20.7

bind: Update to 9.20.7

For details see:
https://downloads.isc.org/isc/bind9/9.20.5/doc/arm/html/notes.html#notes-for-bind-9-20-7

Excerpt:

"Notes for BIND 9.20.7
New Features

    Implement the min-transfer-rate-in configuration option.
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    Add HTTPS record query to host command line tool.
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    Implement sig0key-checks-limit and sig0message-checks-limit.
...

Bug Fixes

    Fix dual-stack-servers configuration option.
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    Fix a data race causing a permanent active client increase.
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    Fix deferred validation of unsigned DS and DNSKEY records.
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    Fix RPZ race condition during a reconfiguration.
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    “CNAME and other data check” not applied to all types.
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    Relax private DNSKEY and RRSIG constraints.
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    Remove NSEC/DS/NSEC3 RRSIG check from dns_message_parse().
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    Fix TTL issue with ANY queries processed through RPZ “passthru”.
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    dnssec-signzone needs to check for a NULL key when setting offline.
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    Fix a bug in the statistics channel when querying zone transfer information.
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    Fix assertion failure when dumping recursing clients.
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    Dump the active resolver fetches from dns_resolver_dumpfetches()"

Signed-off-by: Matthias Fischer <matthias.fischer@ipfire.org>