fix(aci): update detector serializer to accept list of `dataSources`

[ameliahsu]

in the future detectors could have multiple data sources, so it's better to have the validator already set up to accept a list of dataSources now

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

:white_check_mark: All tests successful. No failed tests found.

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #93577       +/-   ##
===========================================
+ Coverage   46.31%   88.00%   +41.69%     
===========================================
  Files       10307    10323       +16     
  Lines      594236   595069      +833     
  Branches    23140    23140               
===========================================
+ Hits       275191   523712   +248521     
+ Misses     318552    70864   -247688     
  Partials      493      493               

[getsantry[bot]]

This issue has gone three weeks without activity. In another week, I will close it.

But! If you comment or otherwise update it, I will reset the clock, and if you remove the label Waiting for: Community, I will leave it alone ... forever!

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"A weed is but an unloved flower." ― Ella Wheeler Wilcox 🥀