Don't use Int32 indices in rand kernels.

[maleadt]

Fixes #1963

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +61.96 🎉

Comparison is base (3321fc8) 0.00% compared to head (05009ec) 61.96%.

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #1969       +/-   ##
===========================================
+ Coverage    0.00%   61.96%   +61.96%     
===========================================
  Files         145      150        +5     
  Lines       12256    12516      +260     
===========================================
+ Hits            0     7756     +7756     
+ Misses      12256     4760     -7496     

Impacted Files	Coverage Δ
src/random.jl	63.79% <0.00%> (+63.79%)	⬆️

... and 102 files with indirect coverage changes

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