Upgrade solc version

[yrong]

Upgrade to the LTS version 0.8.33

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.75%. Comparing base (d03a091) to head (a188300).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1672   +/-   ##
=======================================
  Coverage   90.75%   90.75%           
=======================================
  Files          20       20           
  Lines         909      909           
  Branches      166      166           
=======================================
  Hits          825      825           
  Misses         67       67           
  Partials       17       17           

Flag	Coverage Δ
solidity	90.75% <ø> (ø)

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