fix: change from u8 to u16 conversion to prevent key-value pairs length overflow

[mmsqe]

Description

closes: #250

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[srdtrk]

Thanks for the PR! I left some comments. Also, you should also make the same changes in the sp1 programs which read these inputs.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.47%. Comparing base (ec5227e) to head (8611557).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #251   +/-   ##
=======================================
  Coverage   99.47%   99.47%           
=======================================
  Files          12       12           
  Lines         572      572           
=======================================
  Hits          569      569           
  Misses          3        3           

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[srdtrk]

I've updated the sp1 program, thanks you for the contribution