refactor: fix typo in error message

[yuler]

🔗 Linked issue

❓ Type of change

• 📖 Documentation (updates to the documentation, readme, or JSdoc annotations)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

[pi0]

Thanks!

[codecov]

Codecov Report

Merging #73 (c569da4) into main (8c5ff33) will not change coverage.
Report is 1 commits behind head on main.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##             main      #73   +/-   ##
=======================================
  Coverage   85.01%   85.01%           
=======================================
  Files           5        5           
  Lines         387      387           
  Branches       48       48           
=======================================
  Hits          329      329           
  Misses         58       58           

Files	Coverage Δ
src/get-port.ts	74.85% <0.00%> (ø)