Do not call Random for singletone lists

[snuyanzin]

There is no need to call random to pick a random element from list in case there is less than 2 elements

[codecov-commenter]

Codecov Report

Merging #564 (ea661bc) into main (77806d3) will decrease coverage by 0.08%.
The diff coverage is 56.25%.

@@             Coverage Diff              @@
##               main     #564      +/-   ##
============================================
- Coverage     92.68%   92.60%   -0.09%     
  Complexity     2412     2412              
============================================
  Files           250      250              
  Lines          5047     5055       +8     
  Branches        543      546       +3     
============================================
+ Hits           4678     4681       +3     
- Misses          241      247       +6     
+ Partials        128      127       -1     

Impacted Files	Coverage Δ
.../java/net/datafaker/service/FakeValuesService.java	86.69% <56.25%> (-0.63%)	⬇️
.../main/java/net/datafaker/service/FakerContext.java	89.74% <0.00%> (-2.57%)	⬇️

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