fix: load Requires.jl only if needed

[avik-pal]

Previous

julia> @time_imports using LossFunctions
               ┌ 0.0 ms Requires.__init__() 
    173.5 ms  Requires 99.67% compilation time
      4.0 ms  LossFunctions

Current

julia> @time_imports using LossFunctions
      3.5 ms  LossFunctions

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.85%. Comparing base (cc0f67d) to head (46d65d4).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #180      +/-   ##
==========================================
+ Coverage   95.84%   95.85%   +0.01%     
==========================================
  Files          10       10              
  Lines         529      531       +2     
==========================================
+ Hits          507      509       +2     
  Misses         22       22              

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