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 41.15%. Comparing base (20d87db) to head (e35da99).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #21   +/-   ##
=======================================
  Coverage   41.15%   41.15%           
=======================================
  Files           3        3           
  Lines         294      294           
  Branches       82       82           
=======================================
  Hits          121      121           
  Misses        173      173           

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