Change "solaris" to "Solaris"

[cakebaker]

While reviewing #102 I noticed we set HOST_OS_NAME to solaris on Solaris. I think it should be Solaris.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.75%. Comparing base (bca4515) to head (371ead0).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #103   +/-   ##
=======================================
  Coverage   93.75%   93.75%           
=======================================
  Files           5        5           
  Lines         784      784           
=======================================
  Hits          735      735           
  Misses         49       49           

Flag	Coverage Δ
macos_latest	99.35% <ø> (ø)
ubuntu_latest	99.37% <ø> (ø)
windows_latest	92.99% <ø> (ø)

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