use Random explicitly

[vchuravy]

In Julia 1.11 some work has been done to move standard libraries out of the "sysimage" and also make them upgradable (so they would no longer be strongly tied to the Julia version).
The Random stdlib is a bit special in the sense that it commits "type piracy" by overloading the Base.rand function for types that it doesn't own. An example of that is rand() which is defined in Random.
While code will still be able to call rand() etc in 1.11 without loading Random there are some performance implications that makes it so it is better to load Random up front.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (0edec16) 96.56% compared to head (ced5c27) 96.56%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #270   +/-   ##
=======================================
  Coverage   96.56%   96.56%           
=======================================
  Files           6        6           
  Lines         785      785           
=======================================
  Hits          758      758           
  Misses         27       27           

Files	Coverage Δ
src/precompile.jl	100.00% <ø> (ø)

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