fix: kt, nt for KeyStateRecord type for OpenAPI spec

[Sotatek-Patrick-Vu]

basing.KeyStateRecord default from keripy results in kt: string; nt: string in auto-generated types instead of string | string[]

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.91%. Comparing base (1f22907) to head (568fbb5).
⚠️ Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #409      +/-   ##
==========================================
+ Coverage   86.60%   86.91%   +0.31%     
==========================================
  Files          25       25              
  Lines        5286     5451     +165     
==========================================
+ Hits         4578     4738     +160     
- Misses        708      713       +5     

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