Update Microsoft.Extensions.AI version to 9.4.0-preview.1.25207.5

[MackinnonBuck]

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 75.16%. Comparing base (9118f9b) to head (0304685).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6249      +/-   ##
==========================================
- Coverage   79.23%   75.16%   -4.08%     
==========================================
  Files         225      331     +106     
  Lines       16666    19784    +3118     
  Branches        0      406     +406     
==========================================
+ Hits        13205    14870    +1665     
- Misses       3461     4641    +1180     
- Partials        0      273     +273     

Flag	Coverage Δ
unittests	75.16% <ø> (-4.08%)	:arrow_down:

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