Release v0.13.0

[macladson]

A new breaking release for:

• Remove patch (not used by deps) #66
• Bump tree_hash #68
• Add clippy to CI #69
• Run tests through Miri on CI #70
• Update tree_hash_derive used in tests #71
• Implement From<Infallible> for Error #72
• Do not fail CI if code coverage fails #74
• Add context_deserialize impl #73
• impl Error #56
• Optimise SSZ encoding and decoding #55
• Add RuntimeVariableList and RuntimeFixedVector #67
• Bump ethereum_ssz version #75

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 57.10%. Comparing base (695fbf0) to head (e26d9d1).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #76   +/-   ##
=======================================
  Coverage   57.10%   57.10%           
=======================================
  Files          10       10           
  Lines         345      345           
=======================================
  Hits          197      197           
  Misses        148      148           

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