fix: pass hostname to getPort as well

[danielroe]

what port is available depends on the hostname we're checking, but we were always checking localhost, even when we were listening on another port

See nuxt/nuxt#14476.

[codecov]

Codecov Report

Merging #34 (48ee18f) into main (f4ab4f7) will increase coverage by 0.31%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      nuxt/framework#34      +/-   ##
==========================================
+ Coverage   38.30%   38.62%   +0.31%     
==========================================
  Files           3        3              
  Lines         577      580       +3     
  Branches       28       28              
==========================================
+ Hits          221      224       +3     
  Misses        328      328              
  Partials       28       28              

Impacted Files	Coverage Δ
src/index.ts	81.57% <100.00%> (+0.29%)	⬆️

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