chore: add ijjk as a codeowner

[styfle]

Luc and Timer haven't work on nft in a couple years so adding ijjk as a codeowner

[codecov]

Codecov Report

Merging #259 (4a948c6) into main (cf453a5) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #259   +/-   ##
=======================================
  Coverage   80.64%   80.64%           
=======================================
  Files          13       13           
  Lines        1452     1452           
  Branches      540      540           
=======================================
  Hits         1171     1171           
  Misses        116      116           
  Partials      165      165           

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