CI: test cross-compiling to x86_64-unknown-illumos instead of Solaris

[pitdicker]

Apparently cross dropped support for the x86_64-sun-solaris target (cross-rs/cross#1432), making our CI fail.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (0b4d5ff) 91.85% compared to head (3df7ede) 91.85%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1437   +/-   ##
=======================================
  Coverage   91.85%   91.85%           
=======================================
  Files          40       40           
  Lines       17469    17469           
=======================================
  Hits        16046    16046           
  Misses       1423     1423           

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[djc]

@steveklabnik as someone who might know some Illumos users, do you happen to have any feedback on this? Is this the right thing to be doing? (Not sure if Oxide systems end up using chrono somehow.)

[steveklabnik]

Thanks for the cc, I have pinged work chat, let's see.

[steveklabnik]

Yeah, this seems good: x86_64-unknown-illumos is the target we actually use. Thanks again for checking in!

[pitdicker]

@steveklabnik Thank you!