Fixed CURIE validation to be conformant.

[cmungall]

Fixes linkml/linkml#1942

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 62.88%. Comparing base (80425ed) to head (27b9158).
Report is 12 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #303      +/-   ##
==========================================
- Coverage   62.89%   62.88%   -0.02%     
==========================================
  Files          62       62              
  Lines        8528     8528              
  Branches     2436     2436              
==========================================
- Hits         5364     5363       -1     
  Misses       2554     2554              
- Partials      610      611       +1     

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