dns: validate address type in lookupService

[lazerg]

dns.lookupService() and dns.promises.lookupService() abort the process with a native assertion when address is a non-string that still coerces to a valid IP, like a Buffer. isIP() stringifies its argument, so the existing guard passes and the raw value reaches the C++ binding, where it trips CHECK(args[1]->IsString()). Validating that address is a string first, as dgram already does, makes a bad type throw ERR_INVALID_ARG_TYPE instead of crashing.

Fixes: #64877

[nodejs-github-bot]

Review requested:

• @nodejs/net

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.17%. Comparing base (67af6d1) to head (f6b29e6).

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #64878   +/-   ##
=======================================
  Coverage   90.16%   90.17%           
=======================================
  Files         746      746           
  Lines      242763   242768    +5     
  Branches    45761    45768    +7     
=======================================
+ Hits       218898   218921   +23     
+ Misses      15352    15321   -31     
- Partials     8513     8526   +13     

Files with missing lines	Coverage Δ
lib/dns.js	98.66% <100.00%> (+0.01%)	⬆️
lib/internal/dns/promises.js	98.07% <100.00%> (+<0.01%)	⬆️

... and 35 files with indirect coverage changes

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