refactor(get-modflow): don't hard-code available os tags

[wpbonelli]

Since these are given to change, it seems sufficient to raise (as we do) if a corresponding asset doesn't exist.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 76.3%. Comparing base (bb9824e) to head (347abe6).
Report is 41 commits behind head on develop.

Files with missing lines	Patch %	Lines
flopy/utils/get_modflow.py	0.0%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           develop   #2426     +/-   ##
=========================================
+ Coverage     68.4%   76.3%   +7.8%     
=========================================
  Files          294     294             
  Lines        59390   59875    +485     
=========================================
+ Hits         40652   45704   +5052     
+ Misses       18738   14171   -4567     

Files with missing lines	Coverage Δ
flopy/utils/get_modflow.py	63.6% <0.0%> (+37.3%)	⬆️

... and 247 files with indirect coverage changes

[mwtoews]

Agree this should not be hard-coded.

And on that topic, conda/pixi have different platform specifiers like win-64, linux-64, osx-64, osx-arm64, etc., the compete list is here.

[wpbonelli]

And on that topic, conda/pixi have different platform specifiers like win-64, linux-64, osx-64, osx-arm64, etc., the compete list is here.

Thanks for this, I had wondered whether there was a standard. It would make sense to use the same for our releases, I guess.