[kevin9327]

Follow-up to #4232, as discussed in this review thread.

JSON is UTF-8, so the two existing jwt tests now decode the header and payload with utf8 instead of ascii. With ascii, any non-ASCII character in a payload (for example a company name from a non-English locale) would be decoded as the wrong characters before JSON.parse. This only touches the tests; faker.internet.jwt() itself is unchanged.

This PR was prepared with AI assistance; I reviewed the change.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.14%. Comparing base (5415aec) to head (649ac25).

Additional details and impacted files

@@           Coverage Diff           @@
##             next    #4268   +/-   ##
=======================================
  Coverage   99.14%   99.14%           
=======================================
  Files        1179     1179           
  Lines        3976     3976           
  Branches      723      723           
=======================================
  Hits         3942     3942           
  Misses         29       29           
  Partials        5        5           

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