update Google Gemini model

[svilupp]

• Added a new Gemini Experimental model from November 2024 (gemini-exp-1121 with alias gemexp).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.98%. Comparing base (aa481ab) to head (eab182e).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #237   +/-   ##
=======================================
  Coverage   91.98%   91.98%           
=======================================
  Files          47       47           
  Lines        4640     4640           
=======================================
  Hits         4268     4268           
  Misses        372      372           

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