adding enum for semconv versions

[brettmc]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.00%. Comparing base (100e593) to head (e3128c4).

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #1301   +/-   ##
=========================================
  Coverage     74.00%   74.00%           
- Complexity     2367     2368    +1     
=========================================
  Files           347      348    +1     
  Lines          7077     7079    +2     
=========================================
+ Hits           5237     5239    +2     
  Misses         1840     1840           

Flag	Coverage Δ
8.1	74.00% <100.00%> (+<0.01%)	⬆️
8.2	74.00% <100.00%> (+<0.01%)	⬆️
8.3	74.00% <100.00%> (+<0.01%)	⬆️
8.4	72.87% <100.00%> (+<0.01%)	⬆️

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Files	Coverage Δ
src/SemConv/Version.php	100.00% <100.00%> (ø)

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