test: add missing test coverage for setLocalAddress()
Add missing coverage for setLocalAddress() method of dns.Resolver class. The case where a valid IPv4 argument was supplied along with an invalid IPv6 argument was not being checked.
Refs: https://coverage.nodejs.org/coverage-85b42af4398073f8/lib/internal/dns/utils.js.html#L124
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
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