chore(deps): move SortableJS as dev deps

[ghiscoding]

• SortableJS is already required by Slickgrid-Universal and is only used by Jest in Angular-Slickgrid, so it should be moved to dev deps for that reason.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (9fde237) to head (41113b7).

Additional details and impacted files

@@            Coverage Diff            @@
##            master     #1407   +/-   ##
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  Coverage   100.00%   100.00%           
=========================================
  Files            7         7           
  Lines          905       905           
  Branches       299       295    -4     
=========================================
  Hits           905       905           

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