error on extra input when deserializing Union[None] for some SSZ union type

[ralexstokes]

discovered in the Oak Security audit

Excess bytes in the encoding of None do not trigger errors

[codecov]

Codecov Report

Patch coverage: 66.66% and project coverage change: +0.02 🎉

Comparison is base (b872969) 75.26% compared to head (39d1bb7) 75.29%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #83      +/-   ##
==========================================
+ Coverage   75.26%   75.29%   +0.02%     
==========================================
  Files          18       18              
  Lines         857      862       +5     
==========================================
+ Hits          645      649       +4     
- Misses        212      213       +1     

Impacted Files	Coverage Δ
ssz-rs/src/union.rs	56.66% <66.66%> (+4.66%)	⬆️

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