Update ai module version to 1.5.4 in Dependencies.toml

[MohamedSabthar]

Purpose

Related to: ballerina-platform/ballerina-library#8317

Examples

Checklist

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 50.60%. Comparing base (a5d1575) to head (8cd0840).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #19   +/-   ##
=======================================
  Coverage   50.60%   50.60%           
=======================================
  Files           4        4           
  Lines         249      249           
  Branches       73       73           
=======================================
  Hits          126      126           
  Misses        123      123           

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