Downgrade the Ballerina Gradle plugin version

[ThisaruGuruge]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 38.83%. Comparing base (2cbf790) to head (21fc729).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #20   +/-   ##
=======================================
  Coverage   38.83%   38.83%           
=======================================
  Files           2        2           
  Lines         224      224           
  Branches       87       87           
=======================================
  Hits           87       87           
  Misses        137      137           

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