Add GNU/Hurd to HOST_OS_NAME

[pinotree]

The reported OS name by uname is "GNU".

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.72%. Comparing base (6692ed1) to head (2ccf550).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #122   +/-   ##
=======================================
  Coverage   93.72%   93.72%           
=======================================
  Files           5        5           
  Lines         781      781           
=======================================
  Hits          732      732           
  Misses         49       49           

Flag	Coverage Δ
macos_latest	99.35% <ø> (ø)
ubuntu_latest	99.37% <ø> (ø)
windows_latest	92.96% <ø> (ø)

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