Migrate settings.gradle to settings.gradle.kts

[epeee]

a new version of #1372

[codecov-io]

Codecov Report

Merging #1702 into release/2.x will not change coverage.
The diff coverage is n/a.

@@              Coverage Diff               @@
##             release/2.x    #1702   +/-   ##
==============================================
  Coverage          86.42%   86.42%           
  Complexity          2471     2471           
==============================================
  Files                308      308           
  Lines               6491     6491           
  Branches             815      815           
==============================================
  Hits                5610     5610           
  Misses               684      684           
  Partials             197      197

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[TimvdLippe]

Awesome thanks! Feel free to also update build.gradle with 1 gradle file per PR (to make reviewing easy and fast).