Update ai module version to 1.5.4 in Dependencies.toml

[MohamedSabthar]

Purpose

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

Examples

Checklist

• Linked to an issue

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 35.58%. Comparing base (e1d1599) to head (d8def8b).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #27   +/-   ##
=======================================
  Coverage   35.58%   35.58%           
=======================================
  Files           5        5           
  Lines         444      444           
  Branches      112      112           
=======================================
  Hits          158      158           
  Misses        286      286           

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