Create dns resolution task eagerly on python 3.12+

[bdraco]

What do these changes do?

DNS resolution may be able to happen synchronously if the host is already known. Effectively the same change as #8661

Are there changes in behavior for the user?

no

Is it a substantial burden for the maintainers to support this?

no

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.56%. Comparing base (8a97e03) to head (ba48fe2).
Report is 731 commits behind head on master.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #9343   +/-   ##
=======================================
  Coverage   98.56%   98.56%           
=======================================
  Files         107      107           
  Lines       34942    34947    +5     
  Branches     4145     4147    +2     
=======================================
+ Hits        34439    34444    +5     
  Misses        335      335           
  Partials      168      168           

Flag	Coverage Δ
CI-GHA	98.44% <87.50%> (-0.01%)	⬇️
OS-Linux	98.10% <87.50%> (-0.01%)	⬇️
OS-Windows	96.51% <87.50%> (-0.01%)	⬇️
OS-macOS	97.78% <87.50%> (-0.01%)	⬇️
Py-3.10.11	97.66% <62.50%> (-0.01%)	⬇️
Py-3.10.15	97.60% <62.50%> (-0.01%)	⬇️
Py-3.11.10	97.66% <62.50%> (-0.01%)	⬇️
Py-3.11.9	97.73% <62.50%> (-0.01%)	⬇️
Py-3.12.6	98.15% <75.00%> (-0.02%)	⬇️
Py-3.13.0-rc.2	98.13% <75.00%> (-0.02%)	⬇️
Py-3.9.13	97.56% <62.50%> (-0.01%)	⬇️
Py-3.9.20	97.50% <62.50%> (-0.01%)	⬇️
Py-pypy7.3.16	97.12% <62.50%> (-0.01%)	⬇️
VM-macos	97.78% <87.50%> (-0.01%)	⬇️
VM-ubuntu	98.10% <87.50%> (-0.01%)	⬇️
VM-windows	96.51% <87.50%> (-0.01%)	⬇️

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[patchback]

Backport to 3.10: 💚 backport PR created

✅ Backport PR branch: patchback/backports/3.10/5762ed61c64feccb239d7dc025c36ede3a9cf118/pr-9343

Backported as #9345

🤖 @patchback
I'm built with octomachinery and
my source is open — https://github.com/sanitizers/patchback-github-app.

[patchback]

Backport to 3.11: 💚 backport PR created

✅ Backport PR branch: patchback/backports/3.11/5762ed61c64feccb239d7dc025c36ede3a9cf118/pr-9343

Backported as #9346

🤖 @patchback
I'm built with octomachinery and
my source is open — https://github.com/sanitizers/patchback-github-app.