Revert "Generate semconv/v1.40.0"

[dmathieu]

Reverts #7929

I meant to merge this so the package would be available, even if we're not using it. But it seems this makes users unhappy as they upgrade their semantic conventions versions but can't use the latest detectors.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.7%. Comparing base (c38a4a5) to head (313c4fd).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #7978     +/-   ##
=======================================
- Coverage   81.7%   81.7%   -0.1%     
=======================================
  Files        304     304             
  Lines      23333   23333             
=======================================
- Hits       19080   19077      -3     
- Misses      3864    3867      +3     
  Partials     389     389             

see 2 files with indirect coverage changes

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