fix(resolver): handle None result.service from getnameinfo()

[rnagulapalle]

Summary

getnameinfo() returns a NameinfoResult where .service is typed as str | None. The existing code passes it directly to int() which mypy correctly rejects:

aiohttp/resolver.py:131:32: error: Argument 1 to "int" has incompatible type "str | None"; expected "str | Buffer | SupportsInt | SupportsIndex | SupportsTrunc"  [arg-type]

Fix

Fall back to the original numeric port from the address tuple when result.service is None:

# Before
port = int(result.service)

# After
port = int(result.service) if result.service is not None else address[1]

This matches the pattern already used in the non-link-local IPv6 path and the IPv4 path (both use address[1] directly).

Test plan

• Existing resolver tests pass
• mypy check on aiohttp/resolver.py passes with no arg-type errors

[rnagulapalle]

Closing — will be re-raised by Phalanx CI Fixer autonomously.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.92%. Comparing base (438cb40) to head (4459e6e).
⚠️ Report is 209 commits behind head on master.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #12392      +/-   ##
==========================================
- Coverage   99.11%   98.92%   -0.19%     
==========================================
  Files         130      134       +4     
  Lines       45432    46639    +1207     
  Branches     2400     2429      +29     
==========================================
+ Hits        45028    46137    +1109     
- Misses        273      373     +100     
+ Partials      131      129       -2     

Flag	Coverage Δ
CI-GHA	98.98% <100.00%> (+0.01%)	⬆️
OS-Linux	98.72% <100.00%> (+0.01%)	⬆️
OS-Windows	96.98% <100.00%> (-0.01%)	⬇️
OS-macOS	97.88% <100.00%> (+0.01%)	⬆️
Py-3.10.11	97.39% <100.00%> (-0.03%)	⬇️
Py-3.10.20	97.86% <100.00%> (-0.03%)	⬇️
Py-3.11.15	98.11% <100.00%> (+0.02%)	⬆️
Py-3.11.9	97.65% <100.00%> (+0.02%)	⬆️
Py-3.12.10	97.73% <100.00%> (+0.02%)	⬆️
Py-3.12.13	98.20% <100.00%> (+0.01%)	⬆️
Py-3.13.12	?
Py-3.13.13	98.45% <100.00%> (?)
Py-3.14.3	?
Py-3.14.3t	?
Py-3.14.4	98.51% <100.00%> (?)
Py-3.14.4t	97.51% <100.00%> (?)
Py-pypy3.11.13-7.3.20	?
Py-pypy3.11.15-7.3.21	97.35% <100.00%> (?)
VM-macos	97.88% <100.00%> (+0.01%)	⬆️
VM-ubuntu	98.72% <100.00%> (+0.01%)	⬆️
VM-windows	96.98% <100.00%> (-0.01%)	⬇️
cython-coverage	38.17% <3.70%> (?)

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[codspeed-hq]

Merging this PR will not alter performance

✅ 67 untouched benchmarks
⏩ 4 skipped benchmarks¹

---

_{Comparing rnagulapalle:fix/resolver-service-none-mypy (4459e6e) with master (53f6e91)}

Footnotes

1. 4 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩