Remove gensim dependency to fix Python 3.14 build

[robin-atlasbio]

Summary

• Removes the gensim dependency by inlining the two trivial regex functions that text2term actually uses from it (strip_non_alphanum and strip_multiple_whitespaces)
• Both functions are simple re.sub calls — the gensim originals just add a to_unicode() call which is a no-op for str input on Python 3
• This eliminates a heavy transitive dependency tree (gensim pulls in numpy, scipy, smart-open, etc.) and fixes installation on Python 3.14 where gensim fails to build due to native extension compilation issues

Changes

• text2term/onto_utils.py: Replace from gensim.parsing import ... with two local function definitions using the same regex patterns
• pyproject.toml: Remove gensim~=4.3.2 from dependencies

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.80%. Comparing base (cae1a62) to head (23ce7cb).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #27      +/-   ##
==========================================
+ Coverage   86.74%   86.80%   +0.06%     
==========================================
  Files          16       16              
  Lines        1305     1311       +6     
  Branches      208      208              
==========================================
+ Hits         1132     1138       +6     
  Misses        118      118              
  Partials       55       55              

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