Refactor(middleware-jwt): make function styles consistent

[atasoya]

Used arrow function for unauthorizedResponse for consistency.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.26%. Comparing base (4f5a305) to head (7257021).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4449   +/-   ##
=======================================
  Coverage   91.26%   91.26%           
=======================================
  Files         171      171           
  Lines       10927    10927           
  Branches     3150     3149    -1     
=======================================
  Hits         9973     9973           
  Misses        953      953           
  Partials        1        1           

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