Allow patch bumps for our SSZ crates

[paulhauner]

Allows for 0.8.x versions for ethereum_ssz and ethereum_ssz_derive.

This is driven by a new release on those crates: https://github.com/sigp/ethereum_ssz/releases/tag/v0.8.1

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 55.55%. Comparing base (2b01793) to head (fb4dda3).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #38      +/-   ##
==========================================
+ Coverage   54.19%   55.55%   +1.35%     
==========================================
  Files           8        8              
  Lines         262      270       +8     
==========================================
+ Hits          142      150       +8     
  Misses        120      120              

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