Add resolver.arpa to the built in empty zones

RFC 9462 adds resolver.arpa to the lists of empty zones.

6.4. Handling Non-DDR Queries for resolver.arpa

DNS resolvers that support DDR by responding to queries for _dns.resolver.arpa. MUST treat resolver.arpa as a
locally served zone per [RFC6303]. In practice, this means that resolvers SHOULD respond to queries of any
type other than SVCB for _dns.resolver.arpa. with NODATA and queries of any type for any domain name under
resolver.arpa with NODATA.

Edited Feb 15, 2024 by Mark Andrews

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