[PR #9366/43deadb2 backport][3.11] Small speed up to update_headers

[patchback]

This is a backport of PR #9366 as merged into master (43deadb).

What do these changes do?

• Avoid checking to see if the port is default if no port is set: For most cases we can avoid the is_default_port check which has to work out the default port internally in yarl since if there is no explict port set, it must be the default port
• Avoid using strip for a single char check

Event if we have to call is_default_port, explict_port will already be cached

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 97.80%. Comparing base (224345e) to head (ff141d1).
Report is 4 commits behind head on 3.11.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             3.11    #9382   +/-   ##
=======================================
  Coverage   97.80%   97.80%           
=======================================
  Files         108      108           
  Lines       35051    35054    +3     
  Branches     4185     4186    +1     
=======================================
+ Hits        34280    34283    +3     
  Misses        574      574           
  Partials      197      197           

Flag	Coverage Δ
CI-GHA	97.67% <100.00%> (+<0.01%)	⬆️
OS-Linux	97.36% <100.00%> (+<0.01%)	⬆️
OS-Windows	94.85% <100.00%> (+<0.01%)	⬆️
OS-macOS	97.06% <100.00%> (+<0.01%)	⬆️
Py-3.10.11	96.92% <100.00%> (-0.01%)	⬇️
Py-3.10.15	96.86% <100.00%> (+<0.01%)	⬆️
Py-3.11.10	96.93% <100.00%> (+<0.01%)	⬆️
Py-3.11.9	97.00% <100.00%> (+<0.01%)	⬆️
Py-3.12.6	97.40% <100.00%> (+<0.01%)	⬆️
Py-3.13.0-rc.2	97.38% <100.00%> (+<0.01%)	⬆️
Py-3.9.13	96.83% <100.00%> (+<0.01%)	⬆️
Py-3.9.20	96.77% <100.00%> (+<0.01%)	⬆️
Py-pypy7.3.16	96.38% <100.00%> (+<0.01%)	⬆️
VM-macos	97.06% <100.00%> (+<0.01%)	⬆️
VM-ubuntu	97.36% <100.00%> (+<0.01%)	⬆️
VM-windows	94.85% <100.00%> (+<0.01%)	⬆️

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