[PR #9309/e4028333 backport][3.10] Fix building the URL in BaseRequest when the host contains a port or IPv6 address

[patchback]

This is a backport of PR #9309 as merged into master (e402833).

What do these changes do?

The port was incorrectly being passed in the host field to URL.build when the Host header included the port

Are there changes in behavior for the user?

Calling BaseRequest.url will not fail with yarl 1.13.0+ when the host header has a port

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

no

Related issue number

fixes #9307

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.79%. Comparing base (d32d580) to head (b4df984).
Report is 1 commits behind head on 3.10.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             3.10    #9318   +/-   ##
=======================================
  Coverage   97.78%   97.79%           
=======================================
  Files         108      108           
  Lines       34837    34842    +5     
  Branches     4163     4163           
=======================================
+ Hits        34067    34072    +5     
  Misses        573      573           
  Partials      197      197           

Flag	Coverage Δ
CI-GHA	97.68% <100.00%> (+<0.01%)	⬆️
OS-Linux	97.36% <100.00%> (+<0.01%)	⬆️
OS-Windows	94.97% <100.00%> (+<0.01%)	⬆️
OS-macOS	97.05% <100.00%> (-0.02%)	⬇️
Py-3.10.11	97.03% <100.00%> (+<0.01%)	⬆️
Py-3.10.15	96.96% <100.00%> (+<0.01%)	⬆️
Py-3.11.10	96.94% <100.00%> (+<0.01%)	⬆️
Py-3.11.9	97.01% <100.00%> (+<0.01%)	⬆️
Py-3.12.6	97.41% <100.00%> (+<0.01%)	⬆️
Py-3.13.0-rc.2	97.39% <100.00%> (+<0.01%)	⬆️
Py-3.8.10	94.47% <100.00%> (+<0.01%)	⬆️
Py-3.8.18	96.76% <100.00%> (+<0.01%)	⬆️
Py-3.9.13	96.94% <100.00%> (-0.01%)	⬇️
Py-3.9.20	96.88% <100.00%> (+<0.01%)	⬆️
Py-pypy7.3.16	96.48% <100.00%> (+<0.01%)	⬆️
VM-macos	97.05% <100.00%> (-0.02%)	⬇️
VM-ubuntu	97.36% <100.00%> (+<0.01%)	⬆️
VM-windows	94.97% <100.00%> (+<0.01%)	⬆️

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