Revert "Update to Gradle 5"

[neslihanturan]

Reverts #2860

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@@           Coverage Diff            @@
##             master   #3019   +/-   ##
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  Coverage          ?   4.43%           
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  Files             ?     259           
  Lines             ?   12261           
  Branches          ?    1051           
========================================
  Hits              ?     544           
  Misses            ?   11678           
  Partials          ?      39

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