Bump tree_hash version, allow SSZ patch updates

[paulhauner]

Continuing the round-robin of version bumps

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 55.55%. Comparing base (e867ed5) to head (194947c).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #40   +/-   ##
=======================================
  Coverage   55.55%   55.55%           
=======================================
  Files           8        8           
  Lines         270      270           
=======================================
  Hits          150      150           
  Misses        120      120           

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[michaelsproul]

Looks good, thanks! For some reason I failed to consider that we'd need to bump tree_hash here

[michaelsproul]

FYI there's no difference between 0.8.0 and 0.8 version requirements. They both allow semver compatible updates in the patch version (last digit)

https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#specifying-dependencies-from-cratesio