Improve performance of _encode_host

[bdraco]

What do these changes do?

Improve performance of _encode_host

• If we are not running the potential ip address path, avoid checking for IPv6 zone
• If the parsed address is not IPv6, avoid trying to join the IPv6 zone back to it

This one is very small, I only noticed it because I was looking over _encode_host
and wondering why we were looking for an IP zone outside of the ip address block

Are there changes in behavior for the user?

no

before

after

[bdraco]

While this is wrong, we probably shouldn't change it for IPv4.... since we aren't supposed to support it for IPv6 according to https://url.spec.whatwg.org/

Support for <zone_id> is intentionally omitted.

There likely isn't a use case for a zone in an IPv4 address but there is for IPv6 (maybe not in practice though).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.57%. Comparing base (cf08033) to head (1ba14bf).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1176      +/-   ##
==========================================
- Coverage   95.57%   95.57%   -0.01%     
==========================================
  Files          30       30              
  Lines        4926     4924       -2     
  Branches      448      447       -1     
==========================================
- Hits         4708     4706       -2     
  Misses        192      192              
  Partials       26       26              

Flag	Coverage Δ
CI-GHA	95.53% <100.00%> (-0.01%)	⬇️
MyPy	42.15% <100.00%> (-0.03%)	⬇️
OS-Linux	99.38% <100.00%> (-0.01%)	⬇️
OS-Windows	99.48% <100.00%> (-0.01%)	⬇️
OS-macOS	99.10% <100.00%> (-0.01%)	⬇️
Py-3.10.11	99.00% <100.00%> (-0.01%)	⬇️
Py-3.10.15	99.23% <100.00%> (-0.01%)	⬇️
Py-3.11.10	99.23% <100.00%> (-0.01%)	⬇️
Py-3.11.9	99.00% <100.00%> (-0.01%)	⬇️
Py-3.12.6	99.23% <100.00%> (-0.01%)	⬇️
Py-3.13.0-rc.3	99.23% <100.00%> (-0.01%)	⬇️
Py-3.8.10	98.95% <100.00%> (-0.01%)	⬇️
Py-3.8.18	99.18% <100.00%> (-0.01%)	⬇️
Py-3.9.13	98.95% <100.00%> (-0.01%)	⬇️
Py-3.9.20	99.18% <100.00%> (-0.01%)	⬇️
Py-pypy7.3.11	99.23% <100.00%> (-0.01%)	⬇️
Py-pypy7.3.16	99.23% <100.00%> (-0.01%)	⬇️
Py-pypy7.3.17	99.26% <100.00%> (-0.01%)	⬇️
VM-macos-latest	99.10% <100.00%> (-0.01%)	⬇️
VM-ubuntu-latest	99.38% <100.00%> (-0.01%)	⬇️
VM-windows-latest	99.48% <100.00%> (-0.01%)	⬇️
pytest	99.38% <100.00%> (-0.01%)	⬇️

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