Skip mDNS test on macOS

[Sean-Der]

Broken on GitHub Actions
Failed to enable mDNS over IPv4: (stub net does not listen on udp4)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.32%. Comparing base (bd194f6) to head (366fd00).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #930      +/-   ##
==========================================
- Coverage   88.39%   88.32%   -0.07%     
==========================================
  Files          46       46              
  Lines        5969     5969              
==========================================
- Hits         5276     5272       -4     
- Misses        480      482       +2     
- Partials      213      215       +2     

Flag	Coverage Δ
go	88.32% <ø> (-0.07%)	⬇️

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