Add the Connecticut EITC to the list of refundable credits

[PavelMakarchuk]

Fixes #4252

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.15%. Comparing base (1d89e3d) to head (c0880b9).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4253   +/-   ##
=======================================
  Coverage   99.15%   99.15%           
=======================================
  Files        2401     2401           
  Lines       34765    34766    +1     
  Branches      164      164           
=======================================
+ Hits        34472    34473    +1     
  Misses        261      261           
  Partials       32       32           

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