fix(cbor): fix module specifier in import

[kt3k]

The relative import from "../bytes/concat.ts" does not work when publishing to JSR

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.57%. Comparing base (b4e5d21) to head (ba7b18f).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6099   +/-   ##
=======================================
  Coverage   96.56%   96.57%           
=======================================
  Files         534      534           
  Lines       40589    40589           
  Branches     6093     6093           
=======================================
+ Hits        39195    39198    +3     
+ Misses       1349     1347    -2     
+ Partials       45       44    -1     

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