Use the msgpack impl provided by cosmwasm_std

[uint]

Closes #55

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.24%. Comparing base (866e75f) to head (70c14ed).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #89      +/-   ##
==========================================
+ Coverage   82.22%   82.24%   +0.02%     
==========================================
  Files          14       14              
  Lines        1783     1774       -9     
  Branches     1783     1774       -9     
==========================================
- Hits         1466     1459       -7     
  Misses        294      294              
+ Partials       23       21       -2     

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