fix(s.union): fix union overrides

[kyranet]

The overridden methods were not supposed to nest UnionValidators

[codecov-commenter]

Codecov Report

Merging #62 (c5ec519) into main (708276e) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main      #62   +/-   ##
=======================================
  Coverage   97.32%   97.33%           
=======================================
  Files          47       47           
  Lines        1235     1238    +3     
  Branches      255      257    +2     
=======================================
+ Hits         1202     1205    +3     
  Misses         28       28           
  Partials        5        5           

Impacted Files	Coverage Δ
src/validators/UnionValidator.ts	80.85% <100.00%> (+1.30%)	⬆️

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